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Kumari S, Kumar S, Pratap S, Kubakaddi SS. Ab-initiotransport model to study the thermoelectric performance of MoS 2, MoSe 2, and WS 2monolayers by using Boltzmann transport equation. J Phys Condens Matter 2024; 36:315501. [PMID: 38653314 DOI: 10.1088/1361-648x/ad4225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Accepted: 04/23/2024] [Indexed: 04/25/2024]
Abstract
The potential for thermoelectric applications of two-dimensional materials is quite promising. Usingab-initiocalculations, we have investigated the electronic band structure, phonon band structure, electronic density of states, and phonon density of states of monolayers MoS2, MoSe2, and WS2. In order to compute the thermoelectric properties of monolayers MoS2, MoSe2, and WS2, we used theab-initiomodel suggested by Faghaniniaet al(2015Phys. Rev.B91235123). Within this model, by using inputs from density functional theory and considering all relevant elastic and inelastic scattering mechanisms, we have calculated the thermoelectric properties of monolayers MoS2, MoSe2, and WS2over various ranges of temperature (T) and carrier concentration (n). The obtained results of Seebeck coefficients (S) and figure of merit (ZT) atT= 300 K for bothn/p-types of monolayers MoS2, MoSe2, and WS2are in good agreement with the findings obtained by other models using the Boltzmann transport equation within a constant relaxation time framework.
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Affiliation(s)
- Shweta Kumari
- Department of Physics & Astronomical Science, Central University of Himachal Pradesh, Kangra 176206, Himachal Pradesh, India
| | - Sandeep Kumar
- Department of Physics & Astronomical Science, Central University of Himachal Pradesh, Kangra 176206, Himachal Pradesh, India
| | - Surender Pratap
- Department of Physics & Astronomical Science, Central University of Himachal Pradesh, Kangra 176206, Himachal Pradesh, India
| | - Shrishail S Kubakaddi
- Department of Physics, K.L.E. Technological University, Hubballi 580 031, Karnataka, India
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2
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Li J, Wang JJ, Segal D. Thermal transport in fullerene-based molecular junctions: Molecular dynamics simulations. J Phys Condens Matter 2024. [PMID: 38688291 DOI: 10.1088/1361-648x/ad459b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
We investigate phonon thermal transport of fullerene-based single-molecule junctions by employing classical molecular dynamics simulations.
The thermal conductances of fullerene monomers, dimers, and trimers are computed through three distinct molecular dynamics methods, by following the equilibration dynamics in one method, and using two other nonequilibrium simulation methods. We discuss technical aspects of the simulation techniques, and show that their predictions for the thermal conductance agree.
Our simulations reveal that the thermal conductance of fullerene monomer and dimer junctions are similar, yet the thermal conductance of trimer junctions is significantly reduced.
This study could assist in the design of high-performing thermoelectric junctions, where low thermal conductance is desired.
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Affiliation(s)
- Joanna Li
- Physics, University of Toronto - St George Campus, 80 St George St, Toronto, Toronto, Ontario, M5S 3H6, CANADA
| | - Jonathan J Wang
- Chemistry, University of Toronto - St George Campus, 80 St George St, Toronto, Toronto, Ontario, M5S 3H6, CANADA
| | - Dvira Segal
- Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario, M5S 3H6, CANADA
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3
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Wilson CM, Ganesh R, Crandles DA. Localisation of vibrational modes in high-entropy oxides. J Phys Condens Matter 2024; 36:295701. [PMID: 38437726 DOI: 10.1088/1361-648x/ad2ff1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Accepted: 03/04/2024] [Indexed: 03/06/2024]
Abstract
The recently-discovered high-entropy oxides (HEO's) offer a paradoxical combination of crystalline arrangement and high disorder. They differ qualitatively from established paradigms for disordered solids such as glasses and alloys. In these latter systems, it is well known that disorder induces localised vibrational excitations. In this article, we explore the possibility of disorder-induced localisation in Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O, the prototypical HEO with rock-salt structure. To describe phononic excitations, we model the interatomic potentials for the cation-oxygen interactions by fitting to the physical properties of the parent binary oxides. We validate our model against the experimentally determined crystal structure and optical conductivity. The resulting phonon spectrum shows wave-like propagating modes at low energies and localised modes at high energies. Localisation is reflected in signatures such as participation ratio and correlation amplitude. Finally, we argue that mass disorder can be increased to enhance localisation. We consider a hypothetical material, high-entropy telluride-oxide, where tellurium atoms are admixed into the anion sublattice. This shows a larger localised fraction, with additional localised modes appearing in the middle of the spectrum. Our results demonstrate that HEO's are a promising platform to study Anderson localisation of phonons.
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Affiliation(s)
- C M Wilson
- Department of Physics, Brock University, St. Catharines, Ontario L2S 3A1, Canada
| | - R Ganesh
- Department of Physics, Brock University, St. Catharines, Ontario L2S 3A1, Canada
| | - D A Crandles
- Department of Physics, Brock University, St. Catharines, Ontario L2S 3A1, Canada
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Cravero R, Tlili A, Paterson J, Tomelleri M, Marcello P, Debord R, Pailhès S, Bourgeois O, Hippert F, Le Qui D, Raty JY, Noe P, Giordano VM. Glass-Like Phonon Dynamics and Thermal Transport in a GeTe Nano-Composite at Low Temperature. Small 2024:e2310209. [PMID: 38634392 DOI: 10.1002/smll.202310209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 01/29/2024] [Indexed: 04/19/2024]
Abstract
In this work, the experimental evidence of glass-like phonon dynamics and thermal conductivity in a nanocomposite made of GeTe and amorphous carbon is reported, which is of interest for microelectronics, and specifically phase change memories. It is shown that, the total thermal conductivity is reduced by a factor of three at room temperature with respect to pure GeTe, due to the reduction of both electronic and phononic contributions. This latter, similarly to glasses, is small and weakly increasing with temperature between 100 and 300 K, indicating a mostly diffusive thermal transport and reaching a value of 0.86(7) Wm-1K-1 at room temperature. A thorough investigation of the nanocomposite's phonon dynamics reveals the appearance of an excess intensity in the low energy vibrational density of states, reminiscent of the Boson peak in glasses. These features can be understood in terms of an enhanced phonon scattering at the interfaces, due to the presence of elastic heterogeneities, at wavelengths in the 2-20 nm range. The findings confirm recent simulation results on crystalline/amorphous nanocomposites and open new perspectives in phonon and thermal engineering through the direct manipulation of elastic heterogeneities.
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Affiliation(s)
- R Cravero
- Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France
- Institut NEEL, CNRS, Université Grenoble Alpes, 25 avenue des Martyrs, Grenoble, F-38042, France
| | - A Tlili
- Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France
| | - J Paterson
- CEA, LETI, Université Grenoble Alpes, Grenoble, 38000, France
| | - M Tomelleri
- CEA, LETI, Université Grenoble Alpes, Grenoble, 38000, France
| | - P Marcello
- Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France
| | - R Debord
- Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France
| | - S Pailhès
- Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France
| | - O Bourgeois
- Institut NEEL, CNRS, Université Grenoble Alpes, 25 avenue des Martyrs, Grenoble, F-38042, France
| | - F Hippert
- CNRS, Grenoble INP, LMGP, Université Grenoble Alpes, Grenoble, F-38000, France
| | - D Le Qui
- FNRS and CESAM, Université de Liége, Sart-Tilman, 4000, Belgique
| | - J-Y Raty
- FNRS and CESAM, Université de Liége, Sart-Tilman, 4000, Belgique
| | - P Noe
- CEA, LETI, Université Grenoble Alpes, Grenoble, 38000, France
| | - V M Giordano
- Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France
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Ahammed B, Ertekin E. Configurational Disorder, Strong Anharmonicity, and Coupled Host Dynamics Lead to Superionic Transport in Li 3YCl 6 (LYC). Adv Mater 2024; 36:e2310537. [PMID: 38279784 DOI: 10.1002/adma.202310537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 12/30/2023] [Indexed: 01/28/2024]
Abstract
In superionic crystals, liquid-like ionic diffusivities often come hand-in-hand with ultra-low thermal conductivity and soft vibrational dynamics. However, generalized relationships between ion transport and vibrational dynamics remain elusive due to the diversity of superionic materials and complex underlying mechanisms. Here, the links between vibrational dynamics and ion transport in close-packed lithium halide ion conductor Li3YCl6 (LYC) are examined using a suite of atomistic first-principles methods. It is shown that configurational disorder, lattice anharmonicity, and coupled host-mobile ion vibrational dynamics together induce a transition to the superionic state. Statistical correlations between ionic hops and activation of the distribution of vibrational modes are found. However, typical phenomena associated with superionic conductors such as selective breakdown of zone-boundary soft phonons, or long wavelength transverse acoustic modes as in the 'phonon-liquid-electron crystal' concept, are not present. Instead, anharmonic zone-boundary modes aiding Li diffusion are found to broaden and soften selectively but persist across the superionic transition. These anharmonic modes couple Li ion motion with the vibrations of the flexible close-packed anion framework, which remains stable and facilitates ionic hopping. The results provide insights into how configurational disorder and soft-yet-resilient vibrational modes enable ionic hopping, particularly in 3D close-packed crystals.
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Affiliation(s)
- Ballal Ahammed
- Department of Mechanical Science & Engineering, University of Illinois at Urbana-Champaign, Illinois, 61801, USA
| | - Elif Ertekin
- Department of Mechanical Science & Engineering, University of Illinois at Urbana-Champaign, Illinois, 61801, USA
- Materials Research Laboratory, University of Illinois at Urbana-Champaign, Illinois, 61801, USA
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6
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Lujan D, Choe J, Chaudhary S, Ye G, Nnokwe C, Rodriguez-Vega M, He J, Gao FY, Nunley TN, Baldini E, Zhou J, Fiete GA, He R, Li X. Spin-orbit exciton-induced phonon chirality in a quantum magnet. Proc Natl Acad Sci U S A 2024; 121:e2304360121. [PMID: 38457517 PMCID: PMC10945760 DOI: 10.1073/pnas.2304360121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 11/17/2023] [Indexed: 03/10/2024] Open
Abstract
The interplay of charge, spin, lattice, and orbital degrees of freedom in correlated materials often leads to rich and exotic properties. Recent studies have brought new perspectives to bosonic collective excitations in correlated materials. For example, inelastic neutron scattering experiments revealed non-trivial band topology for magnons and spin-orbit excitons (SOEs) in a quantum magnet CoTiO3 (CTO). Here, we report phonon properties resulting from a combination of strong spin-orbit coupling, large crystal field splitting, and trigonal distortion in CTO. Specifically, the interaction between SOEs and phonons endows chirality to two [Formula: see text] phonon modes and leads to large phonon magnetic moments observed in magneto-Raman spectra. The remarkably strong magneto-phononic effect originates from the hybridization of SOEs and phonons due to their close energy proximity. While chiral phonons have been associated with electronic topology in some materials, our work suggests opportunities may arise by exploring chiral phonons coupled to topological bosons.
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Affiliation(s)
- David Lujan
- Department of Physics, Center of Complex Quantum Systems, The University of Texas at Austin, Austin, TX78712
- Center for Dynamics and Control of Materials, The University of Texas at Austin, Austin, TX78712
| | - Jeongheon Choe
- Department of Physics, Center of Complex Quantum Systems, The University of Texas at Austin, Austin, TX78712
- Center for Dynamics and Control of Materials, The University of Texas at Austin, Austin, TX78712
| | - Swati Chaudhary
- Department of Physics, Center of Complex Quantum Systems, The University of Texas at Austin, Austin, TX78712
- Department of Physics, Northeastern University, Boston, MA02115
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA02139
| | - Gaihua Ye
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX79409
| | - Cynthia Nnokwe
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX79409
| | - Martin Rodriguez-Vega
- Department of Physics, Center of Complex Quantum Systems, The University of Texas at Austin, Austin, TX78712
- Department of Physics, Northeastern University, Boston, MA02115
| | - Jiaming He
- Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX78712
| | - Frank Y. Gao
- Department of Physics, Center of Complex Quantum Systems, The University of Texas at Austin, Austin, TX78712
- Center for Dynamics and Control of Materials, The University of Texas at Austin, Austin, TX78712
| | - T. Nathan Nunley
- Department of Physics, Center of Complex Quantum Systems, The University of Texas at Austin, Austin, TX78712
- Center for Dynamics and Control of Materials, The University of Texas at Austin, Austin, TX78712
| | - Edoardo Baldini
- Department of Physics, Center of Complex Quantum Systems, The University of Texas at Austin, Austin, TX78712
- Center for Dynamics and Control of Materials, The University of Texas at Austin, Austin, TX78712
| | - Jianshi Zhou
- Center for Dynamics and Control of Materials, The University of Texas at Austin, Austin, TX78712
- Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX78712
| | - Gregory A. Fiete
- Department of Physics, Northeastern University, Boston, MA02115
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA02139
| | - Rui He
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX79409
| | - Xiaoqin Li
- Department of Physics, Center of Complex Quantum Systems, The University of Texas at Austin, Austin, TX78712
- Center for Dynamics and Control of Materials, The University of Texas at Austin, Austin, TX78712
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7
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Strasser N, Wieser S, Zojer E. Predicting Spin-Dependent Phonon Band Structures of HKUST-1 Using Density Functional Theory and Machine-Learned Interatomic Potentials. Int J Mol Sci 2024; 25:3023. [PMID: 38474269 DOI: 10.3390/ijms25053023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 02/28/2024] [Accepted: 02/29/2024] [Indexed: 03/14/2024] Open
Abstract
The present study focuses on the spin-dependent vibrational properties of HKUST-1, a metal-organic framework with potential applications in gas storage and separation. Employing density functional theory (DFT), we explore the consequences of spin couplings in the copper paddle wheels (as the secondary building units of HKUST-1) on the material's vibrational properties. By systematically screening the impact of the spin state on the phonon bands and densities of states in the various frequency regions, we identify asymmetric -COO- stretching vibrations as being most affected by different types of magnetic couplings. Notably, we also show that the DFT-derived insights can be quantitatively reproduced employing suitably parametrized, state-of-the-art machine-learned classical potentials with root-mean-square deviations from the DFT results between 3 cm-1 and 7 cm-1. This demonstrates the potential of machine-learned classical force fields for predicting the spin-dependent properties of complex materials, even when explicitly considering spins only for the generation of the reference data used in the force-field parametrization process.
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Affiliation(s)
- Nina Strasser
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, 8010 Graz, Austria
| | - Sandro Wieser
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, 8010 Graz, Austria
| | - Egbert Zojer
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, 8010 Graz, Austria
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8
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Mendis B. Modelling dynamical 3D electron diffraction intensities. II. The role of inelastic scattering. Acta Crystallogr A Found Adv 2024; 80:178-188. [PMID: 38270201 PMCID: PMC10913673 DOI: 10.1107/s2053273323010690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 12/13/2023] [Indexed: 01/26/2024] Open
Abstract
The strong interaction of high-energy electrons with a crystal results in both dynamical elastic scattering and inelastic events, particularly phonon and plasmon excitation, which have relatively large cross sections. For accurate crystal structure refinement it is therefore important to uncover the impact of inelastic scattering on the Bragg beam intensities. Here a combined Bloch wave-Monte Carlo method is used to simulate phonon and plasmon scattering in crystals. The simulated thermal and plasmon diffuse scattering are consistent with experimental results. The simulations also confirm the empirical observation of a weaker unscattered beam intensity with increasing energy loss in the low-loss regime, while the Bragg-diffracted beam intensities do not change significantly. The beam intensities include the diffuse scattered background and have been normalized to adjust for the inelastic scattering cross section. It is speculated that the random azimuthal scattering angle during inelastic events transfers part of the unscattered beam intensity to the inner Bragg reflections. Inelastic scattering should not significantly influence crystal structure refinement, provided there are no artefacts from any background subtraction, since the relative intensity of the diffracted beams (which includes the diffuse scattering) remains approximately constant in the low energy loss regime.
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Affiliation(s)
- Budhika Mendis
- Department of Physics, Durham University, South Road, Durham, DH1 3LE, United Kingdom
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9
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Qin Z, Dai L, Li M, Li S, Wu H, White KE, Gani G, Weiss PS, Hu Y. Moiré Pattern Controlled Phonon Polarizer Based on Twisted Graphene. Adv Mater 2024:e2312176. [PMID: 38429904 DOI: 10.1002/adma.202312176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 02/23/2024] [Indexed: 03/03/2024]
Abstract
Twisted van der Waals materials featuring Moiré patterns present new design possibilities and demonstrate unconventional behaviors in electrical, optical, spintronic, and superconducting properties. However, experimental exploration of thermal transport across Moiré patterns has not been as extensive, despite its critical role in nanoelectronics, thermal management, and energy technologies. Here, the first experimental study is conducted on thermal transport across twisted graphene, demonstrating a phonon polarizer concept from the rotational misalignment between stacked layers. The direct thermal and acoustic measurements, structural characterizations, and atomistic modeling, reveal a modulation up to 631% in thermal conductance with various Moiré angles, while maintaining a high acoustic transmission. By comparing experiments with density functional theory and molecular dynamics simulations, mode-dependent phonon transmissions are quantified based on the angle alignment of graphene band structures and attributed to the coupling among flexural phonon modes. The agreement confirms the dominant tuning mechanisms in adjusting phonon transmission from high-frequency thermal modes while having negligible effects on low-frequency acoustic modes near Brillouin zone center. This study offers crucial insights into the fundamental thermal transport in Moiré structures, opening avenues for the invention of quantum thermal devices and new design methodologies based on manipulations of vibrational band structures and phonon spectra.
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Affiliation(s)
- Zihao Qin
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Lingyun Dai
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Man Li
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Suixuan Li
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Huan Wu
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Katherine E White
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Gilad Gani
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Paul S Weiss
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Yongjie Hu
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
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Matson JR, Alam MN, Varnavides G, Sohr P, Knight S, Darakchieva V, Stokey M, Schubert M, Said A, Beechem T, Narang P, Law S, Caldwell JD. The Role of Optical Phonon Confinement in the Infrared Dielectric Response of III-V Superlattices. Adv Mater 2024; 36:e2305106. [PMID: 38039437 DOI: 10.1002/adma.202305106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 07/16/2023] [Indexed: 12/03/2023]
Abstract
Polar dielectrics are key materials of interest for infrared (IR) nanophotonic applications due to their ability to host phonon-polaritons that allow for low-loss, subdiffractional control of light. The properties of phonon-polaritons are limited by the characteristics of optical phonons, which are nominally fixed for most "bulk" materials. Superlattices composed of alternating atomically thin materials offer control over crystal anisotropy through changes in composition, optical phonon confinement, and the emergence of new modes. In particular, the modified optical phonons in superlattices offer the potential for so-called crystalline hybrids whose IR properties cannot be described as a simple mixture of the bulk constituents. To date, however, studies have primarily focused on identifying the presence of new or modified optical phonon modes rather than assessing their impact on the IR response. This study focuses on assessing the impact of confined optical phonon modes on the hybrid IR dielectric function in superlattices of GaSb and AlSb. Using a combination of first principles theory, Raman, FTIR, and spectroscopic ellipsometry, the hybrid dielectric function is found to track the confinement of optical phonons, leading to optical phonon spectral shifts of up to 20 cm-1 . These results provide an alternative pathway toward designer IR optical materials.
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Affiliation(s)
- Joseph R Matson
- Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, TN, 37212, USA
| | - Md Nazmul Alam
- Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA
| | - Georgios Varnavides
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - Patrick Sohr
- Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA
| | - Sean Knight
- Solid State Physics and NanoLund, Lund University, Lund, 22100, Sweden
- Competence Center for III-Nitride Technology, C3NiT - Janzèn, Linköping University, Linköping, 58183, Sweden
- Terahertz Materials Analysis Center (THeMAC), Linköping University, Linköping, 58183, Sweden
| | - Vanya Darakchieva
- Solid State Physics and NanoLund, Lund University, Lund, 22100, Sweden
- Competence Center for III-Nitride Technology, C3NiT - Janzèn, Linköping University, Linköping, 58183, Sweden
- Terahertz Materials Analysis Center (THeMAC), Linköping University, Linköping, 58183, Sweden
| | - Megan Stokey
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Mathias Schubert
- Solid State Physics and NanoLund, Lund University, Lund, 22100, Sweden
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Ayman Said
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Thomas Beechem
- School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
| | - Prineha Narang
- Physical Sciences Division, College of Letters and Science, University of California, Los Angeles (UCLA), Los Angeles, CA, 90095, USA
| | - Stephanie Law
- Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, 16802, USA
| | - Joshua D Caldwell
- Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, TN, 37212, USA
- Department of Mechanical Engineering, Vanderbilt University, Nashville, TN, 37212, USA
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11
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Rudysh MY, Fedorchuk AO, Brik MG, Grechenkov J, Bocharov D, Piskunov S, Popov AI, Piasecki M. Electronic, Optical, and Vibrational Properties of an AgAlS 2 Crystal in a High-Pressure Phase. Materials (Basel) 2023; 16:7017. [PMID: 37959614 PMCID: PMC10648680 DOI: 10.3390/ma16217017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 10/23/2023] [Accepted: 10/29/2023] [Indexed: 11/15/2023]
Abstract
The aim of this study is to comprehensively examine the structural composition and properties of the AgAlS2 crystal during its high-pressure phase. This analysis delves into the second coordination environment of the crystal structure and elucidates the distinct transformations it undergoes during the phase transition. The band energy structure was calculated, and the origin of electronic levels was clarified. It is shown that the crystal becomes non-stratified during the phase transition. This study also determined the values of the crystal's carrier effective masses, underscoring its spatial anisotropy. It was found that the calculated optical functions are similar to the crystal in the chalcopyrite structure, and their differences are shown. Further, this study involved the calculation of the crystal's phonon spectrum, revealing the spectrum's transformation during the phase transition. The vibrational frequencies were also obtained, with a symmetrical classification of vibrational modes. Finally, this study derived the infrared and Raman spectra of the AgAlS2 crystal, thereby providing a comprehensive picture of the crystal during its high-pressure phase.
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Affiliation(s)
- Myron Ya. Rudysh
- Department of Theoretical Physics, Jan Dlugosz University in Częstochowa, 13/15, Armii Krajowej Al., 42-200 Częstochowa, Poland;
| | - Anatolii O. Fedorchuk
- Department of Inorganic and Organic Chemistry, Lviv National University of Veterinary Medicine and Biotechnologies, Pekarska Str. 50, 79010 Lviv, Ukraine;
| | - Mikhail G. Brik
- School of Optoelectronic Engineering & CQUPT-BUL Innovation Institute, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
- Centre of Excellence for Photoconversion, Vinča Institute of Nuclear Sciences—National Institute of the Republic of Serbia, University of Belgrade, 11001 Belgrade, Serbia
- Institute of Physics, University of Tartu, 50411 Tartu, Estonia;
- Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia; (D.B.); (S.P.); (A.I.P.)
- Academy of Romanian Scientists, Ilfov Str. No. 3, 030167 Bucharest, Romania
| | - Jurij Grechenkov
- Institute of Physics, University of Tartu, 50411 Tartu, Estonia;
- Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia; (D.B.); (S.P.); (A.I.P.)
| | - Dmitry Bocharov
- Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia; (D.B.); (S.P.); (A.I.P.)
- Transport and Telecommunication Institute, LV-1019 Riga, Latvia
| | - Sergei Piskunov
- Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia; (D.B.); (S.P.); (A.I.P.)
| | - Anatoli I. Popov
- Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia; (D.B.); (S.P.); (A.I.P.)
| | - Michal Piasecki
- Department of Theoretical Physics, Jan Dlugosz University in Częstochowa, 13/15, Armii Krajowej Al., 42-200 Częstochowa, Poland;
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12
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Werheit H. Phase Transitions in Boron Carbide. Materials (Basel) 2023; 16:6734. [PMID: 37895716 PMCID: PMC10608524 DOI: 10.3390/ma16206734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 09/17/2023] [Accepted: 09/25/2023] [Indexed: 10/29/2023]
Abstract
The idealized rhombohedral unit cell of boron carbide is formed by a 12-atom icosahedron and a 3-atom linear chain. Phase transitions are second order and caused by the exchange of B and C sites or by vacancies in the structure. Nevertheless, the impact of such minimal structural changes on the properties can be significant. As the X-ray scattering cross sections of B and C isotopes are very similar, the capability of X-ray fine structure investigation is substantially restricted. Phonon spectroscopy helps close this gap as the frequency and strength of phonons sensitively depend on the bonding force and mass of the vibrating atoms concerned. Phase transitions known to date have been identified due to significant changes of properties: (1) The phase transition near the chemical composition B8C by clear change of the electronic structure; (2) the endothermic temperature-dependent phase transition at 712 K according to the change of specific heat; (3) the high-pressure phase transition at 33.2 GPa by the drastic change of optical appearance from opacity to transparency. These phase transitions affect IR- and Raman-active phonons and other solid-state properties. The phase transitions at B~8C and 712 K mean that a well-defined distorted structure is converted into another one. In the high-pressure phase transition, an apparently well-defined distorted structure changes into a highly ordered one. In all these cases, the distribution of polar C atoms in the icosahedra plays a crucial role.
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Affiliation(s)
- Helmut Werheit
- Faculty of Physics, University Duisburg-Essen, D-47048 Duisburg, Germany
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13
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K. Sivan A, Abad B, Albrigi T, Arif O, Trautvetter J, Ruiz Caridad A, Arya C, Zannier V, Sorba L, Rurali R, Zardo I. GaAs/GaP Superlattice Nanowires for Tailoring Phononic Properties at the Nanoscale: Implications for Thermal Engineering. ACS Appl Nano Mater 2023; 6:18602-18613. [PMID: 37854853 PMCID: PMC10580287 DOI: 10.1021/acsanm.3c04245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 09/21/2023] [Indexed: 10/20/2023]
Abstract
The possibility to tune the functional properties of nanomaterials is key to their technological applications. Superlattices, i.e., periodic repetitions of two or more materials in one or more dimensions, are being explored for their potential as materials with tailor-made properties. Meanwhile, nanowires offer a myriad of possibilities to engineer systems at the nanoscale, as well as to combine materials that cannot be put together in conventional heterostructures due to the lattice mismatch. In this work, we investigate GaAs/GaP superlattices embedded in GaP nanowires and demonstrate the tunability of their phononic and optoelectronic properties by inelastic light scattering experiments corroborated by ab initio calculations. We observe clear modifications in the dispersion relation for both acoustic and optical phonons in the superlattices nanowires. We find that by controlling the superlattice periodicity, we can achieve tunability of the phonon frequencies. We also performed wavelength-dependent Raman microscopy on GaAs/GaP superlattice nanowires, and our results indicate a reduction in the electronic bandgap in the superlattice compared to the bulk counterpart. All of our experimental results are rationalized with the help of ab initio density functional perturbation theory (DFPT) calculations. This work sheds fresh insights into how material engineering at the nanoscale can tailor phonon dispersion and open pathways for thermal engineering.
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Affiliation(s)
- Aswathi K. Sivan
- Department
of Physics, University of Basel, 4056 Basel, Switzerland
| | - Begoña Abad
- Department
of Physics, University of Basel, 4056 Basel, Switzerland
| | - Tommaso Albrigi
- Institut
de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Omer Arif
- NEST,
Istituto Nanoscienze-CNR and Scuola Normale Superiore, 56127 Pisa, Italy
| | | | | | - Chaitanya Arya
- Department
of Physics, University of Basel, 4056 Basel, Switzerland
| | - Valentina Zannier
- NEST,
Istituto Nanoscienze-CNR and Scuola Normale Superiore, 56127 Pisa, Italy
| | - Lucia Sorba
- NEST,
Istituto Nanoscienze-CNR and Scuola Normale Superiore, 56127 Pisa, Italy
| | - Riccardo Rurali
- Institut
de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Ilaria Zardo
- Department
of Physics, University of Basel, 4056 Basel, Switzerland
- Swiss
Nanoscience Institute, University of Basel, 4056 Basel, Switzerland
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14
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Jung Y, Lee W, Han S, Kim BS, Yoo SJ, Jang H. Thermal Transport Properties of Phonons in Halide Perovskites. Adv Mater 2023; 35:e2204872. [PMID: 36036368 DOI: 10.1002/adma.202204872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 08/21/2022] [Indexed: 06/15/2023]
Abstract
Halide perovskites have emerged as promising candidates for various applications, such as photovoltaic, optoelectronic and thermoelectric applications. The knowledge of the thermal transport of halide perovskites is essential for enhancing the device performance for these applications and improving the understanding of heat transport in complicated material systems with atomic disorders. In this work, the current understanding of the experimentally and theoretically obtained thermal transport properties of halide perovskites is reviewed. This study comprehensively examines the reported thermal conductivity of methylammonium lead iodide, which is a prototype material, and provides theoretical frameworks for its lattice vibrational properties. The frameworks and discussions are extended to other halide perovskites and derivative structures. The implications for device applications, such as solar cells and thermoelectrics, are discussed.
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Affiliation(s)
- Yoonseong Jung
- Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 08826, South Korea
| | - Wonsik Lee
- Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 08826, South Korea
| | - Seungbin Han
- Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 08826, South Korea
| | - Beom-Soo Kim
- Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 34114, South Korea
| | - Seung-Jun Yoo
- Future Technology, LG Chem, Seoul, 07796, South Korea
| | - Hyejin Jang
- Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 08826, South Korea
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15
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Holstad TS, Dresselhaus-Marais LE, Ræder TM, Kozioziemski B, van Driel T, Seaberg M, Folsom E, Eggert JH, Knudsen EB, Nielsen MM, Simons H, Haldrup K, Poulsen HF. Real-time imaging of acoustic waves in bulk materials with X-ray microscopy. Proc Natl Acad Sci U S A 2023; 120:e2307049120. [PMID: 37725646 PMCID: PMC10523471 DOI: 10.1073/pnas.2307049120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 08/07/2023] [Indexed: 09/21/2023] Open
Abstract
The dynamics of lattice vibrations govern many material processes, such as acoustic wave propagation, displacive phase transitions, and ballistic thermal transport. The maximum velocity of these processes and their effects is determined by the speed of sound, which therefore defines the temporal resolution (picoseconds) needed to resolve these phenomena on their characteristic length scales (nanometers). Here, we present an X-ray microscope capable of imaging acoustic waves with subpicosecond resolution within mm-sized crystals. We directly visualize the generation, propagation, branching, and energy dissipation of longitudinal and transverse acoustic waves in diamond, demonstrating how mechanical energy thermalizes from picosecond to microsecond timescales. Bulk characterization techniques capable of resolving this level of structural detail have previously been available on millisecond time scales-orders of magnitude too slow to capture these fundamental phenomena in solid-state physics and geoscience. As such, the reported results provide broad insights into the interaction of acoustic waves with the structure of materials, and the availability of ultrafast time-resolved dark-field X-ray microscopy opens a vista of new opportunities for 3D imaging of materials dynamics on their intrinsic submicrosecond time scales.
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Affiliation(s)
- Theodor S. Holstad
- Department of Physics, Technical University of Denmark, Kongens Lyngby2800, Denmark
| | - Leora E. Dresselhaus-Marais
- Department of Materials Science & Engineering, Stanford University, Stanford, CA94305
- SLAC National Accelerator Laboratory, Menlo Park, CA94025-7015
- Physics Division, Lawrence Livermore National Laboratory, Livermore, CA94550-9234
| | - Trygve Magnus Ræder
- Department of Physics, Technical University of Denmark, Kongens Lyngby2800, Denmark
| | - Bernard Kozioziemski
- Physics Division, Lawrence Livermore National Laboratory, Livermore, CA94550-9234
| | - Tim van Driel
- SLAC National Accelerator Laboratory, Menlo Park, CA94025-7015
| | - Matthew Seaberg
- SLAC National Accelerator Laboratory, Menlo Park, CA94025-7015
| | - Eric Folsom
- Physics Division, Lawrence Livermore National Laboratory, Livermore, CA94550-9234
| | - Jon H. Eggert
- Physics Division, Lawrence Livermore National Laboratory, Livermore, CA94550-9234
| | | | | | - Hugh Simons
- Department of Physics, Technical University of Denmark, Kongens Lyngby2800, Denmark
| | - Kristoffer Haldrup
- Department of Physics, Technical University of Denmark, Kongens Lyngby2800, Denmark
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16
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Zhu W, Deng W, Liu Y, Lu J, Wang HX, Lin ZK, Huang X, Jiang JH, Liu Z. Topological phononic metamaterials. Rep Prog Phys 2023; 86. [PMID: 37706242 DOI: 10.1088/1361-6633/aceeee] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Accepted: 08/10/2023] [Indexed: 09/15/2023]
Abstract
The concept of topological energy bands and their manifestations have been demonstrated in condensed matter systems as a fantastic paradigm toward unprecedented physical phenomena and properties that are robust against disorders. Recent years, this paradigm was extended to phononic metamaterials (including mechanical and acoustic metamaterials), giving rise to the discovery of remarkable phenomena that were not observed elsewhere thanks to the extraordinary controllability and tunability of phononic metamaterials as well as versatile measuring techniques. These phenomena include, but not limited to, topological negative refraction, topological 'sasers' (i.e. the phononic analog of lasers), higher-order topological insulating states, non-Abelian topological phases, higher-order Weyl semimetal phases, Majorana-like modes in Dirac vortex structures and fragile topological phases with spectral flows. Here we review the developments in the field of topological phononic metamaterials from both theoretical and experimental perspectives with emphasis on the underlying physics principles. To give a broad view of topological phononics, we also discuss the synergy with non-Hermitian effects and cover topics including synthetic dimensions, artificial gauge fields, Floquet topological acoustics, bulk topological transport, topological pumping, and topological active matters as well as potential applications, materials fabrications and measurements of topological phononic metamaterials. Finally, we discuss the challenges, opportunities and future developments in this intriguing field and its potential impact on physics and materials science.
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Affiliation(s)
- Weiwei Zhu
- Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou 215123, People's Republic of China
- Department of Physics, National University of Singapore, Singapore 117542, Singapore
| | - Weiyin Deng
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510640, People's Republic of China
| | - Yang Liu
- Institute of Theoretical and Applied Physics, School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, People's Republic of China
| | - Jiuyang Lu
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510640, People's Republic of China
| | - Hai-Xiao Wang
- College of Physics and Technology, Guangxi Normal University, Guilin 541004, People's Republic of China
| | - Zhi-Kang Lin
- Institute of Theoretical and Applied Physics, School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, People's Republic of China
| | - Xueqin Huang
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510640, People's Republic of China
| | - Jian-Hua Jiang
- Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou 215123, People's Republic of China
- Institute of Theoretical and Applied Physics, School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, People's Republic of China
| | - Zhengyou Liu
- Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China
- Institute for Advanced Studies, Wuhan University, Wuhan 430072, People's Republic of China
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17
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Kobbekaduwa K, Liu E, Zhao Q, Bains JS, Zhang J, Shi Y, Zheng H, Li D, Cai T, Chen O, Rao AM, Beard MC, Luther JM, Gao J. Ultrafast Carrier Drift Transport Dynamics in CsPbI 3 Perovskite Nanocrystalline Thin Films. ACS Nano 2023; 17:13997-14004. [PMID: 37450660 DOI: 10.1021/acsnano.3c03989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
We study the early time carrier drift dynamics in CsPbI3 nanocrystal thin films with a sub 25 ps time resolution. Prior to trapping, carriers exhibit band-like transport characteristics, which is similar to those of traditional semiconductor solar absorbers including Si and GaAs due to optical phonon and carrier scattering at high temperatures. In contrast to the popular polaron scattering mechanism, the CsPbI3 nanocrystal thin film demonstrates the strongest optical phonon scattering mechanism among other inorganic-organic hybrid perovskites, Si, and GaAs. This ultrafast dynamics study establishes a foundation for understanding the fundamental carrier drift properties that drive perovskite nanocrystal optoelectronics.
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Affiliation(s)
- Kanishka Kobbekaduwa
- Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, United States
| | - Exian Liu
- Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, United States
| | - Qian Zhao
- Chemistry & Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
- School of Materials Science and Engineering, Nankai University, Tianjin 300350, People's Republic of China
| | - Jasjit Singh Bains
- Department of Chemistry, Yousef Haj-Ahmad Department of Engineering, Brock University, 1812 Sir Isaac Way, St Catharines, Ontario L2S 3A1, Canada
| | - Jianbing Zhang
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Ying Shi
- Institute of Atomic and Molecular Physics, Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, People's Republic of China
| | - Haimei Zheng
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Dawen Li
- Department of Electrical and Computer Engineering, Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Tong Cai
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Ou Chen
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Apparao M Rao
- Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, United States
| | - Matthew C Beard
- Chemistry & Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Joseph M Luther
- Chemistry & Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Jianbo Gao
- Department of Chemistry, Yousef Haj-Ahmad Department of Engineering, Brock University, 1812 Sir Isaac Way, St Catharines, Ontario L2S 3A1, Canada
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18
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Haas B, Boland TM, Elsässer C, Singh AK, March K, Barthel J, Koch CT, Rez P. Atomic-Resolution Mapping of Localized Phonon Modes at Grain Boundaries. Nano Lett 2023. [PMID: 37341711 DOI: 10.1021/acs.nanolett.3c01089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/22/2023]
Abstract
Phonon scattering at grain boundaries (GBs) is significant in controlling the nanoscale device thermal conductivity. However, GBs could also act as waveguides for selected modes. To measure localized GB phonon modes, milli-electron volt (meV) energy resolution is needed with subnanometer spatial resolution. Using monochromated electron energy loss spectroscopy (EELS) in the scanning transmission electron microscope (STEM) we have mapped the 60 meV optic mode across GBs in silicon at atomic resolution and compared it to calculated phonon densities of states (DOS). The intensity is strongly reduced at GBs characterized by the presence of 5- and 7-fold rings where bond angles differ from the bulk. The excellent agreement between theory and experiment strongly supports the existence of localized phonon modes and thus of GBs acting as waveguides.
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Affiliation(s)
- Benedikt Haas
- Department of Physics & IRIS Adlershof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany
| | - Tara M Boland
- School for Engineering of Matter Transport and Energy, Arizona State University, Tempe, Arizona 85287-6106, United States
| | - Christian Elsässer
- Fraunhofer Institute for Mechanics of Materials IWM, 79108 Freiburg, Germany
| | - Arunima K Singh
- Department of Physics, Arizona State University, Tempe, Arizona 85287-1504, United States
| | - Katia March
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, 75005 Paris, France
| | - Juri Barthel
- Ernst Ruska-Centre (ER-C 2), Forschungszentrum Jülich, 52428 Jülich, Germany
| | - Christoph T Koch
- Department of Physics & IRIS Adlershof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany
| | - Peter Rez
- Department of Physics, Arizona State University, Tempe, Arizona 85287-1504, United States
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19
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Feng T, Zhou H, Cheng Z, Larkin LS, Neupane MR. A Critical Review of Thermal Boundary Conductance across Wide and Ultrawide Bandgap Semiconductor Interfaces. ACS Appl Mater Interfaces 2023. [PMID: 37326498 DOI: 10.1021/acsami.3c02507] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The emergence of wide and ultrawide bandgap semiconductors has revolutionized the advancement of next-generation power, radio frequency, and opto- electronics, paving the way for chargers, renewable energy inverters, 5G base stations, satellite communications, radars, and light-emitting diodes. However, the thermal boundary resistance at semiconductor interfaces accounts for a large portion of the near-junction thermal resistance, impeding heat dissipation and becoming a bottleneck in the devices' development. Over the past two decades, many new ultrahigh thermal conductivity materials have emerged as potential substrates, and numerous novel growth, integration, and characterization techniques have emerged to improve the TBC, holding great promise for efficient cooling. At the same time, numerous simulation methods have been developed to advance the understanding and prediction of TBC. Despite these advancements, the existing literature reports are widely dispersed, presenting varying TBC results even on the same heterostructure, and there is a large gap between experiments and simulations. Herein, we comprehensively review the various experimental and simulation works that reported TBCs of wide and ultrawide bandgap semiconductor heterostructures, aiming to build a structure-property relationship between TBCs and interfacial nanostructures and to further boost the TBCs. The advantages and disadvantages of various experimental and theoretical methods are summarized. Future directions for experimental and theoretical research are proposed.
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Affiliation(s)
- Tianli Feng
- Department of Mechanical Engineering, University of Utah, Salt Lake City, Utah 84112, United States
| | - Hao Zhou
- Department of Mechanical Engineering, University of Utah, Salt Lake City, Utah 84112, United States
| | - Zhe Cheng
- School of Integrated Circuits and Frontiers Science Center for Nano-optoelectronics, Peking University, Beijing 100871, China
| | - Leighann Sarah Larkin
- Army Research Directorate (ARD), DEVCOM Army Research Laboratory, Adelphi, Maryland 20708, United States
| | - Mahesh R Neupane
- Army Research Directorate (ARD), DEVCOM Army Research Laboratory, Adelphi, Maryland 20708, United States
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20
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Pokryshkin NS, Mantsevich VN, Timoshenko VY. Anti-Stokes Photoluminescence in Halide Perovskite Nanocrystals: From Understanding the Mechanism towards Application in Fully Solid-State Optical Cooling. Nanomaterials (Basel) 2023; 13:1833. [PMID: 37368263 DOI: 10.3390/nano13121833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/05/2023] [Accepted: 06/07/2023] [Indexed: 06/28/2023]
Abstract
Anti-Stokes photoluminescence (ASPL) is an up-conversion phonon-assisted process of radiative recombination of photoexcited charge carriers when the ASPL photon energy is above the excitation one. This process can be very efficient in nanocrystals (NCs) of metalorganic and inorganic semiconductors with perovskite (Pe) crystal structure. In this review, we present an analysis of the basic mechanisms of ASPL and discuss its efficiency depending on the size distribution and surface passivation of Pe-NCs as well as the optical excitation energy and temperature. When the ASPL process is sufficiently efficient, it can result in an escape of most of the optical excitation together with the phonon energy from the Pe-NCs. It can be used in optical fully solid-state cooling or optical refrigeration.
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Affiliation(s)
- Nikolay S Pokryshkin
- Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
- Phys-Bio Institute, University "MEPhI", 115409 Moscow, Russia
| | | | - Victor Y Timoshenko
- Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
- Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia
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21
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Prischepa SL, Kushnir VN. Phonon softening in nanostructured phonon-mediated superconductors (review). J Phys Condens Matter 2023; 35. [PMID: 36947886 DOI: 10.1088/1361-648x/acc6ae] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 03/22/2023] [Indexed: 05/11/2023]
Abstract
Various aspects of phonon spectrum changes in nanostructured phonon-mediated superconductors are considered. It is shown how, with the development of experimental techniques and, accordingly, obtaining new results, the understanding of the influence of the surface and nanoscale on the magnitude of the electron-phonon interaction and the critical temperatureTcchanged and deepened. The review is organized as follows. After theIntroduction, in thesecondpart we give the quick theoretical background for the description of superconductivity within the framework of various formalisms. In thethirdpart we describe the properties of nanostructured (granular) thin films paying attention to the impact of grain sizes and methods of deposition on theTcvalue. The role of material parameters is underlined and different aspects of the behavior of granular thin films are discussed. In thefourthsection the impact of external sources of modification of the phonon spectra like noble gases and organic molecules are considered. Problems and progress in this area are discussed. Thefifthpart is dedicated to the phonon modification and related quantum size effects in nanostructured superconductors. In thesixthpart we review the results of direct evidence of phonon softening in nanostructured superconductors and in theseventhsection we discuss a possible alternative description of the superconducting properties of nanostructured superconductors related to the concept of metamaterials. In theeighthandninthparts we review the impact of substrates with lattice mismatched parameters and graphene sheets, respectively, on the modification of the phonon spectrum and enhancement of superconductivity in various superconducting thin films. Finally, in the lasttenthsection we consider the nonequilibrium superconductivity driven by femtosecond pulses of light, which leads to generation of coherent phonons and to a significant increase in the critical temperature in a number of superconducting materials.
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Affiliation(s)
- S L Prischepa
- Belarusian State University of Informatics and Radioelectronics, P. Browka 6, 220013 Minsk, Belarus
| | - V N Kushnir
- Belarusian State University of Informatics and Radioelectronics, P. Browka 6, 220013 Minsk, Belarus
- Belarusian State University, Nezalezhnasci av. 4, 220030 Minsk, Belarus
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22
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Dudek KK, Iglesias Martínez JA, Ulliac G, Hirsinger L, Wang L, Laude V, Kadic M. Micro-Scale Mechanical Metamaterial with a Controllable Transition in the Poisson's Ratio and Band Gap Formation. Adv Mater 2023; 35:e2210993. [PMID: 36863399 DOI: 10.1002/adma.202210993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 02/27/2023] [Indexed: 05/19/2023]
Abstract
The ability to significantly change the mechanical and wave propagation properties of a structure without rebuilding it is currently one of the main challenges in the field of mechanical metamaterials. This stems from the enormous appeal that such tunable behavior may offer from the perspective of applications ranging from biomedical to protective devices, particularly in the case of micro-scale systems. In this work, a novel micro-scale mechanical metamaterial is proposed that can undergo a transition from one type of configuration to another, with one configuration having a very negative Poisson's ratio, corresponding to strong auxeticity, and the other having a highly positive Poisson's ratio. The formation of phononic band gaps can also be controlled concurrently which can be very useful for the design of vibration dampers and sensors. Finally, it is experimentally shown that the reconfiguration process can be induced and controlled remotely through application of a magnetic field by using appropriately distributed magnetic inclusions.
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Affiliation(s)
- Krzysztof K Dudek
- Institut FEMTO-ST, CNRS, Université Bourgogne Franche-Comté, 25030 Besançon, France
- Institute of Physics, University of Zielona Gora, ul. Szafrana 4a, 65-069 Zielona, Gora, Poland
| | | | - Gwenn Ulliac
- Institut FEMTO-ST, CNRS, Université Bourgogne Franche-Comté, 25030 Besançon, France
| | - Laurent Hirsinger
- Institut FEMTO-ST, CNRS, Université Bourgogne Franche-Comté, 25030 Besançon, France
| | - Lianchao Wang
- Institut FEMTO-ST, CNRS, Université Bourgogne Franche-Comté, 25030 Besançon, France
| | - Vincent Laude
- Institut FEMTO-ST, CNRS, Université Bourgogne Franche-Comté, 25030 Besançon, France
| | - Muamer Kadic
- Institut FEMTO-ST, CNRS, Université Bourgogne Franche-Comté, 25030 Besançon, France
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23
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Groß MF, Schneider JLG, Wei Y, Chen Y, Kalt S, Kadic M, Liu X, Hu G, Wegener M. Tetramode Metamaterials as Phonon Polarizers. Adv Mater 2023; 35:e2211801. [PMID: 36787442 DOI: 10.1002/adma.202211801] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 01/24/2023] [Indexed: 05/05/2023]
Abstract
In classical Cauchy elasticity, 3D materials exhibit six eigenmodes of deformation. Following the 1995 work of Milton and Cherkaev, extremal elastic materials can be classified by the number of eigenmodes, N, out of these six that are "easy". Using Greek number words, this leads to hexamode (N = 6), pentamode (N = 5), tetramode (N = 4), trimode (N = 3), dimode (N = 2), and monomode (N = 1) materials. While hexamode materials are unstable in all regards, the possibility of pentamode metamaterials ("meta-fluids") has attracted considerable attention throughout the last decade. Here, inspired by the 2021 theoretical work of Wei, Liu, and Hu, microstructured 3D polymer-based tetramode metamaterials are designed and characterized by numerical band-structure calculations, fabricated by laser printing, characterized by ultrasound experiments, and compared to the theoretical ideal. An application in terms of a compact and broadband polarizer for acoustical phonons at ultrasound frequencies is demonstrated.
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Affiliation(s)
- Michael Fidelis Groß
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
- Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
| | | | - Yu Wei
- School of Aerospace Engineering, Beijing Institute of Technology (BIT), Beijing, 100081, P. R. China
| | - Yi Chen
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
- Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
| | - Sebastian Kalt
- Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
| | - Muamer Kadic
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
- Institut FEMTO-ST, UMR 6174, CNRS, Université de Bourgogne Franche-Comté (UBFC), Besançon, 25030, France
| | - Xiaoning Liu
- School of Aerospace Engineering, Beijing Institute of Technology (BIT), Beijing, 100081, P. R. China
| | - Genkai Hu
- School of Aerospace Engineering, Beijing Institute of Technology (BIT), Beijing, 100081, P. R. China
| | - Martin Wegener
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
- Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
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24
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Abstract
Superionic conductors exhibiting a periodic crystalline lattice and liquid-like ionic conductivity have emerged as promising materials in energy-conversion devices. Herein, we have investigated the interplay among anharmonic lattice dynamics, thermal conduction, and ultrafast atomic diffusion across the superionic transition of AgCrSe2. We show that the thermal conductivity (κ) contributions from convection and conduction-convection interactions increase simultaneously due to the gradual fluidization of Ag atoms, leading to a temperature-independent κ in the superionic state. We demonstrate a non-Peierls type thermal transport behavior induced by the strong lattice anharmonicity of Ag atoms, which promotes a nontrivial wave-like phonon tunneling in the normal state of AgCrSe2. Our current fluctuation analysis demonstrates an anisotropic phonon-liquid scattering behavior that the in-plane nondispersive transverse acoustic (TA) phonons near the zone boundary collapse, while the zone center and boundary TA phonons in the direction perpendicular to the liquid-like flow of Ag atoms survive.
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Affiliation(s)
- Chen Wang
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, SAR, China
| | - Yue Chen
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, SAR, China
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25
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Havela L, Legut D, Kolorenč J. Hydrogen in actinides: electronic and lattice properties. Rep Prog Phys 2023; 86:056501. [PMID: 36821855 DOI: 10.1088/1361-6633/acbe50] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Accepted: 02/23/2023] [Indexed: 06/18/2023]
Abstract
Hydrides of actinides, their magnetic, electronic, transport, and thermodynamic properties are discussed within a general framework of H impact on bonding, characterized by volume expansion, affecting mainly the 5fstates, and a charge transfer towards H, which influences mostly the 6dand 7sstates. These general mechanisms have diverse impact on individual actinides, depending on the degree of localization of their 5fstates. Hydrogenation of uranium yields UH2and UH3, binary hydrides that are strongly magnetic due to the 5fband narrowing and reduction of the 5f-6dhybridization. Pu hydrides become magnetic as well, mainly as a result of the stabilization of the magnetic 5f5state and elimination of the admixture of the non-magnetic 5f6component.Ab-initiocomputational analyses, which for example suggest that the ferromagnetism ofβ-UH3is rather intricate involving two non-collinear sublattices, are corroborated by spectroscopic studies of sputter-deposited thin films, yielding a clean surface and offering a variability of compositions. It is found that valence-band photoelectron spectra cannot be compared directly with the 5fnground-state density of states. Being affected by electron correlations in the excited final states, they rather reflect the atomic 5fn-1multiplets. Similar tendencies can be identified also in hydrides of binary and ternary intermetallic compounds. H absorption can be used as a tool for fine tuning of electronic structure around a quantum critical point. A new direction is represented by actinide polyhydrides with a potential for high-temperature superconductivity.
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Affiliation(s)
- Ladislav Havela
- Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic
| | - Dominik Legut
- IT4Innovations, VŠB-Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech Republic
| | - Jindřich Kolorenč
- Institute of Physics (FZU), Czech Academy of Sciences, Na Slovance 2,182 00 Prague, Czech Republic
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26
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Pásztorová J, Mansouri Tehrani A, Živković I, Spaldin NA, Rønnow HM. Experimental and theoretical thermodynamic studies in Ba 2MgReO 6-the ground state in the context of Jahn-Teller effect. J Phys Condens Matter 2023; 35:245603. [PMID: 36944255 DOI: 10.1088/1361-648x/acc62a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 03/21/2023] [Indexed: 06/18/2023]
Abstract
We address the degeneracy of the ground state multiplet on the 5d1Re6+ion in double perovskite Ba2MgReO6using a combination of specific heat measurements and density functional calculations. For Ba2MgReO6, two different ground state multiplets have previously been proposed-a quartet (with degeneracyN= 4) (Hirai and Hiroi 2019J. Phys. Soc. Japan88064712) and a doublet (N= 2) (Marjerrisonet al2016Inorg. Chem.5510701). Here we employ two independent methods for the estimation of phonon contribution in heat capacity data to obtain the magnetic entropySmag, which reflects the degeneracy of the ground state multipletNthroughSmag=RlnN. In both cases, we obtain that in the temperature range covering 2 to 120 K the released entropy is better described bySmag=Rln2. The detailed nature of the ground state multiplet in Ba2MgReO6remains an open question.
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Affiliation(s)
- Jana Pásztorová
- Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | | | - Ivica Živković
- Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Nicola A Spaldin
- Department of Materials, ETH Zurich, CH-8093 Zurich, Switzerland
| | - Henrik M Rønnow
- Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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27
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Elalaily T, Berke M, Kedves M, Fülöp G, Scherübl Z, Kanne T, Nygård J, Makk P, Csonka S. Signatures of Gate-Driven Out-of-Equilibrium Superconductivity in Ta/InAs Nanowires. ACS Nano 2023; 17:5528-5535. [PMID: 36912466 PMCID: PMC10062030 DOI: 10.1021/acsnano.2c10877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 03/08/2023] [Indexed: 06/18/2023]
Abstract
Understanding the microscopic origin of the gate-controlled supercurrent (GCS) in superconducting nanobridges is crucial for engineering superconducting switches suitable for a variety of electronic applications. The origin of GCS is controversial, and various mechanisms have been proposed to explain it. In this work, we have investigated the GCS in a Ta layer deposited on the surface of InAs nanowires. Comparison between switching current distributions at opposite gate polarities and between the gate dependence of two opposite side gates with different nanowire-gate spacings shows that the GCS is determined by the power dissipated by the gate leakage. We also found a substantial difference between the influence of the gate and elevated bath temperature on the magnetic field dependence of the supercurrent. Detailed analysis of the switching dynamics at high gate voltages shows that the device is driven into the multiple phase slips regime by high-energy fluctuations arising from the leakage current.
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Affiliation(s)
- Tosson Elalaily
- Department
of Physics, Institute of Physics, Budapest
University of Technology and Economics, Müegyetem rkp. 3., H-1111 Budapest, Hungary
- MTA-BME
Superconducting Nanoelectronics Momentum Research Group, Müegyetem rkp. 3., H-1111 Budapest, Hungary
- Department
of Physics, Faculty of Science, Tanta University, Al-Geish St., 31527 Tanta, Gharbia, Egypt
| | - Martin Berke
- Department
of Physics, Institute of Physics, Budapest
University of Technology and Economics, Müegyetem rkp. 3., H-1111 Budapest, Hungary
- MTA-BME
Superconducting Nanoelectronics Momentum Research Group, Müegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Máté Kedves
- Department
of Physics, Institute of Physics, Budapest
University of Technology and Economics, Müegyetem rkp. 3., H-1111 Budapest, Hungary
- MTA-BME
Correlated van der Waals Structures Momentum Research Group, Müegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Gergő Fülöp
- Department
of Physics, Institute of Physics, Budapest
University of Technology and Economics, Müegyetem rkp. 3., H-1111 Budapest, Hungary
- MTA-BME
Superconducting Nanoelectronics Momentum Research Group, Müegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Zoltán Scherübl
- Department
of Physics, Institute of Physics, Budapest
University of Technology and Economics, Müegyetem rkp. 3., H-1111 Budapest, Hungary
- MTA-BME
Superconducting Nanoelectronics Momentum Research Group, Müegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Thomas Kanne
- Center
for Quantum Devices and Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen, Denmark
| | - Jesper Nygård
- Center
for Quantum Devices and Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen, Denmark
| | - Péter Makk
- Department
of Physics, Institute of Physics, Budapest
University of Technology and Economics, Müegyetem rkp. 3., H-1111 Budapest, Hungary
- MTA-BME
Correlated van der Waals Structures Momentum Research Group, Müegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Szabolcs Csonka
- Department
of Physics, Institute of Physics, Budapest
University of Technology and Economics, Müegyetem rkp. 3., H-1111 Budapest, Hungary
- MTA-BME
Superconducting Nanoelectronics Momentum Research Group, Müegyetem rkp. 3., H-1111 Budapest, Hungary
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28
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Indhu AR, Keerthana L, Dharmalingam G. Plasmonic nanotechnology for photothermal applications - an evaluation. Beilstein J Nanotechnol 2023; 14:380-419. [PMID: 37025366 PMCID: PMC10071519 DOI: 10.3762/bjnano.14.33] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 03/02/2023] [Indexed: 06/19/2023]
Abstract
The application of plasmonic nanoparticles is motivated by the phenomenon of surface plasmon resonance. Owing to the tunability of optothermal properties and enhanced stability, these nanostructures show a wide range of applications in optical sensors, steam generation, water desalination, thermal energy storage, and biomedical applications such as photothermal (PT) therapy. The PT effect, that is, the conversion of absorbed light to heat by these particles, has led to thriving research regarding the utilization of plasmonic nanoparticles for a myriad of applications. The design of conventional nanomaterials for PT conversion has focussed predominantly on the manipulation of photon absorption through bandgap engineering, doping, incorporation, and modification of suitable matrix materials. Plasmonic nanomaterials offer an alternative and attractive approach in this regard, through the flexibility in the excitation of surface plasmons. Specific advantages are the considerable improved bandwidth of the absorption, a higher efficiency of photon absorption, facile tuning, as well as flexibility in the synthesis of plasmonic nanomaterials. This review of plasmonic PT (PPT) research begins with a theoretical discussion on the plasmonic properties of nanoparticles by means of the quasi-static approximation, Mie theory, Gans theory, generic simulations on common plasmonic material morphologies, and the evaluation processes of PT performance. Further, a variety of nanomaterials and material classes that have potential for PPT conversion are elucidated, such as plasmonic metals, bimetals, and metal-metal oxide nanocomposites. A detailed investigation of the essential, but often ignored, concept of thermal, chemical, and aggregation stability of nanoparticles is another part of this review. The challenges that remain, as well as prospective directions and chemistries, regarding nanomaterials for PT conversion are pondered on in the final section of the article, taking into account the specific requirements from different applications.
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Affiliation(s)
- A R Indhu
- Plasmonic Nanomaterials Laboratory, PSG Institute of Advanced Studies, Coimbatore-641004, India
| | - L Keerthana
- Plasmonic Nanomaterials Laboratory, PSG Institute of Advanced Studies, Coimbatore-641004, India
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29
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Cocemasov A, Brinzari V, Nika DL. Rattling-induced suppression of thermal transport in cubic In 2O 3with Sn-Ga diatomic defect. J Phys Condens Matter 2023; 35:195701. [PMID: 36821865 DOI: 10.1088/1361-648x/acbe87] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 02/23/2023] [Indexed: 06/18/2023]
Abstract
We present the first principles study of cubic In2O3with a diatomic defect composed of a Sn atom substituting the In atom at theb-site and a Ga atom embedded in the nearestc-site (structural vacancy) with lattice positions according to the Wyckoff notations. Structural, electronic, phononic and thermal properties were investigated within density functional theory formalism. The lattice anharmonicity effects were taken into account for all possible three-phonon scattering processes. The phonon transport was considered within the Peierls-Boltzmann transport equation with relaxation time approximation. In the relaxed lattice, a strong rearrangement of the initial positions of the atoms in the defect vicinity was revealed, which primarily manifests itself in the displacement of the Sn atom toward another interstitial site. Thus, a cage is formed around the defect by 12 O and 12 In atoms. The calculations of elastic constants and mean square displacements of cage region atoms showed the rattling-like behavior of the Sn atom. Bader charge analysis and electron localization function allowed a deeper understanding and explanation of such behavior. Phonon energy spectra as compared to In2O3and In2O3:(Sn) demonstrated flattening of phonon branches with spatial localization of phonon modes. They also revealed a decrease in average group velocities of phonons, including those of acoustic type, the presence of avoided-crossing features in the low energy range, and an increase of available phase space for three-phonon scattering. Accounting for all these vibrational features due to defect atoms resulted in a thermal conductivity drop at room temperature by more than seven times compared to In2O3.
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Affiliation(s)
- Alexandr Cocemasov
- E. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Department of Theoretical Physics, Moldova State University, Chisinau MD-2009, Moldova
| | - Vladimir Brinzari
- E. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Department of Theoretical Physics, Moldova State University, Chisinau MD-2009, Moldova
| | - Denis L Nika
- E. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Department of Theoretical Physics, Moldova State University, Chisinau MD-2009, Moldova
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30
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Dzhagan V, Mazur N, Kapush O, Selyshchev O, Karnaukhov A, Yeshchenko OA, Danylenko MI, Yukhymchuk V, Zahn DRT. Core and Shell Contributions to the Phonon Spectra of CdTe/CdS Quantum Dots. Nanomaterials (Basel) 2023; 13:921. [PMID: 36903799 PMCID: PMC10004847 DOI: 10.3390/nano13050921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 02/20/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
The parameters of the shell and interface in semiconductor core/shell nanocrystals (NCs) are determinant for their optical properties and charge transfer but are challenging to be studied. Raman spectroscopy was shown earlier to be a suitable informative probe of the core/shell structure. Here, we report the results of a spectroscopic study of CdTe NCs synthesized by a facile route in water, using thioglycolic acid (TGA) as a stabilizer. Both core-level X-ray photoelectron (XPS) and vibrational (Raman and infrared) spectra show that using thiol during the synthesis results in the formation of a CdS shell around the CdTe core NCs. Even though the spectral positions of the optical absorption and photoluminescence bands of such NCs are determined by the CdTe core, the far-infrared absorption and resonant Raman scattering spectra are dominated by the vibrations related with the shell. The physical mechanism of the observed effect is discussed and opposed to the results reported before for thiol-free CdTe Ns as well as CdSe/CdS and CdSe/ZnS core/shell NC systems, where the core phonons were clearly detected under similar experimental conditions.
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Affiliation(s)
- Volodymyr Dzhagan
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
- Physics Department, Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine
| | - Nazar Mazur
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
| | - Olga Kapush
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
| | - Oleksandr Selyshchev
- Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany
- Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, D-09107 Chemnitz, Germany
| | - Anatolii Karnaukhov
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
| | - Oleg A. Yeshchenko
- Physics Department, Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine
| | - Mykola I. Danylenko
- Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine
| | - Volodymyr Yukhymchuk
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
| | - Dietrich R. T. Zahn
- Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany
- Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, D-09107 Chemnitz, Germany
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31
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Hoglund ER, Bao DL, O'Hara A, Pfeifer TW, Hoque MSB, Makarem S, Howe JM, Pantelides ST, Hopkins PE, Hachtel JA. Direct Visualization of Localized Vibrations at Complex Grain Boundaries. Adv Mater 2023; 35:e2208920. [PMID: 36634374 DOI: 10.1002/adma.202208920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 11/25/2022] [Indexed: 06/17/2023]
Abstract
Grain boundaries (GBs) are a prolific microstructural feature that dominates the functionality of a wide class of materials. The functionality at a GB results from the unique atomic arrangements, different from those in the grain, that have driven extensive experimental and theoretical studies correlating atomic-scale GB structures to macroscopic electronic, infrared optical, and thermal properties. In this work, a SrTiO3 GB is examined using atomic-resolution aberration-corrected scanning transmission electron microscopy and ultrahigh-energy-resolution monochromated electron energy-loss spectroscopy, in conjunction with density functional theory. This combination enables the correlation of the GB structure, nonstoichiometry, and chemical bonding with a redistribution of vibrational states within the GB dislocation cores. The new experimental access to localized GB vibrations provides a direct route to quantifying the impact of individual boundaries on macroscopic properties.
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Affiliation(s)
- Eric R Hoglund
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA
| | - De-Liang Bao
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, 37235, USA
| | - Andrew O'Hara
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, 37235, USA
| | - Thomas W Pfeifer
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, 22904, USA
| | - Md Shafkat Bin Hoque
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, 22904, USA
| | - Sara Makarem
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA
| | - James M Howe
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA
| | - Sokrates T Pantelides
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, 37235, USA
| | - Patrick E Hopkins
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, 22904, USA
| | - Jordan A Hachtel
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
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32
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Alsulami A, Alharbi M, Alsaffar F, Alolaiyan O, Aljalham G, Albawardi S, Alsaggaf S, Alamri F, Tabbakh TA, Amer MR. Lattice Transformation from 2D to Quasi 1D and Phonon Properties of Exfoliated ZrS 2 and ZrSe 2. Small 2023; 19:e2205763. [PMID: 36585385 DOI: 10.1002/smll.202205763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 12/07/2022] [Indexed: 06/17/2023]
Abstract
Recent reports on thermal and thermoelectric properties of emerging 2D materials have shown promising results. Among these materials are Zirconium-based chalcogenides such as zirconium disulfide (ZrS2 ), zirconium diselenide (ZrSe2 ), zirconium trisulfide (ZrS3 ), and zirconium triselenide (ZrSe3 ). Here, the thermal properties of these materials are investigated using confocal Raman spectroscopy. Two different and distinctive Raman signatures of exfoliated ZrX2 (where X = S or Se) are observed. For 2D-ZrX2 , Raman modes are in alignment with those reported in literature. However, for quasi 1D-ZrX2 , Raman modes are identical to exfoliated ZrX3 nanosheets, indicating a major lattice transformation from 2D to quasi-1D. Raman temperature dependence for ZrX2 are also measured. Most Raman modes exhibit a linear downshift dependence with increasing temperature. However, for 2D-ZrS2 , a blueshift for A1g mode is detected with increasing temperature. Finally, phonon dynamics under optical heating for ZrX2 are measured. Based on these measurements, the calculated thermal conductivity and the interfacial thermal conductance indicate lower interfacial thermal conductance for quasi 1D-ZrX2 compared to 2D-ZrX2 , which can be attributed to the phonon confinement in 1D. The results demonstrate exceptional thermal properties for Zirconium-based materials, making them ideal for thermoelectric device applications and future thermal management strategies.
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Affiliation(s)
- Awsaf Alsulami
- Center of Excellence for Green Nanotechnologies, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia
| | - Majed Alharbi
- Center of Excellence for Green Nanotechnologies, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia
| | - Fadhel Alsaffar
- Center of Excellence for Green Nanotechnologies, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Olaiyan Alolaiyan
- Center of Excellence for Green Nanotechnologies, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia
| | - Ghadeer Aljalham
- Center of Excellence for Green Nanotechnologies, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia
| | - Shahad Albawardi
- Center of Excellence for Green Nanotechnologies, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia
| | - Sarah Alsaggaf
- Center of Excellence for Green Nanotechnologies, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia
| | - Faisal Alamri
- Center of Excellence for Green Nanotechnologies, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia
| | - Thamer A Tabbakh
- National Center for Nanotechnology, Materials Science Institute, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia
| | - Moh R Amer
- Center of Excellence for Green Nanotechnologies, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia
- Department of Electrical and Computer Engineering, University of California Los Angeles, Los Angeles, CA, 90095, USA
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33
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Hasegawa T, Inui M, Onimaru T, Kajihara Y, Hosokawa S, Nakajima Y, Matsuda K, Takabatake T, Hiroi S, Uchiyama H, Tsutsui S. Phonon dispersion curves in the type-I crystalline and molten clathrate compound Eu 8Ga 16Ge 30. J Phys Condens Matter 2023; 35:114002. [PMID: 36603227 DOI: 10.1088/1361-648x/acb0a5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
The dynamic structure factorS(Q,E), whereQandEare momentum and energy transfer, respectively, has been measured for liquid Eu8Ga16Ge30(EGG), using inelastic x-ray scattering. The excitation energy of the longitudinal acoustic mode in the liquid was scaled to that in liquid Ba8Ga16Sn30(BGS) with the effective mass. This result means that the local structure in both liquids are similar. The longitudinal acoustic excitation energy of type-I clathrate compound EGG disperses faster than that in the liquid, suggesting that the interatomic force is weakened on melting. The lower energy excitation was observed in both liquid EGG and liquid BGS. In comparison with the longitudinal phonon dispersion in crystalline clathrate compound EGG obtained by density functional theory-based calculations, the lower energy in the liquid was found to be near the optical mode energy. The result indicates that the lower energy mode arises from the relative motion between Eu and (Ga, Ge) atoms.
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Affiliation(s)
- Takumi Hasegawa
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8521, Japan
| | - Masanori Inui
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8521, Japan
| | - Takahiro Onimaru
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8521, Japan
| | - Yukio Kajihara
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8521, Japan
| | - Shinya Hosokawa
- Department of Physics, Kumamoto University, Kumamoto 860-8555, Japan
| | - Yoichi Nakajima
- Department of Physics, Kumamoto University, Kumamoto 860-8555, Japan
| | - Kazuhiro Matsuda
- Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Toshiro Takabatake
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8521, Japan
| | - Satoshi Hiroi
- Japan Synchrotron Radiation Research Institute (JASRI), Sayo-cho, Hyogo 679-5198, Japan
| | - Hiroshi Uchiyama
- Japan Synchrotron Radiation Research Institute (JASRI), Sayo-cho, Hyogo 679-5198, Japan
| | - Satoshi Tsutsui
- Japan Synchrotron Radiation Research Institute (JASRI), Sayo-cho, Hyogo 679-5198, Japan
- Institute of Quantum Beam Science, Graduate School of Science and Engineering, Ibaraki University, Hitachi, Ibaraki 316-8511, Japan
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34
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Dzhagan V, Litvinchuk AP, Valakh MY, Zahn DRT. Phonon Raman spectroscopy of nanocrystalline multinary chalcogenides as a probe of complex lattice structures. J Phys Condens Matter 2022; 35:103001. [PMID: 36575889 DOI: 10.1088/1361-648x/acaa18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 12/08/2022] [Indexed: 06/17/2023]
Abstract
Ternary (I-III-VI) and quaternary (I-II-IV-VI) metal-chalcogenides like CuInS2or Cu2ZnSn(S,Se)4are among the materials currently most intensively investigated for various applications in the area of alternative energy conversion and light-emitting devices. They promise more sustainable and affordable solutions to numerous applications, compared to more developed and well understood II-VI and III-V semiconductors. Potentially superior properties are based on an unprecedented tolerance of these compounds to non-stoichiometric compositions and polymorphism. However, if not properly controlled, these merits lead to undesirable coexistence of different compounds in a single polycrystalline lattice and huge concentrations of point defects, becoming an immense hurdle on the way toward real-life applications. Raman spectroscopy of phonons has become one of the most powerful tools of structural diagnostics and probing physical properties of bulk and microcrystalline I-III-VI and I-II-IV-VI compounds. The recent explosive growth of the number of reports on fabrication and characterization of nanostructures of these compounds must be pointed out as well as the steady use of Raman spectroscopy for their characterization. Interpretation of the vibrational spectra of these compound nanocrystals (NCs) and conclusions about their structure can be complicated compared to bulk counterparts because of size and surface effects as well as emergence of new structural polymorphs that are not realizable in the bulk. This review attempts to summarize the present knowledge in the field of I-III-VI and I-II-IV-VI NCs regarding their phonon spectra and capabilities of Raman and IR spectroscopies in the structural characterizations of these promising families of compounds.
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Affiliation(s)
- Volodymyr Dzhagan
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03038 Kyiv, Ukraine
- Physics Department, Taras Shevchenko National University of Kyiv, 60 Volodymyrs'ka str., 01601 Kyiv, Ukraine
| | - Alexander P Litvinchuk
- Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204-5002, United States of America
| | - Mykhailo Ya Valakh
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03038 Kyiv, Ukraine
| | - Dietrich R T Zahn
- Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany
- Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, D-09107 Chemnitz, Germany
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35
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Basak S, Ptok A. Theoretical Study of Dynamical and Electronic Properties of Noncentrosymmetric Superconductor NbReSi. Materials (Basel) 2022; 16:78. [PMID: 36614417 PMCID: PMC9820956 DOI: 10.3390/ma16010078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 12/11/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
The noncentrosymmetric NbReSi superconductor with Tc≃6.5 K is characterized by the relatively large upper critical magnetic field. Its multigap features were observed experimentally. Recent studies suggested the realization of P6¯2m or Ima2 symmetry. We discuss the dynamical properties of both symmetries (e.g., phonon spectra). In this paper, using the ab initio techniques, we clarify this ambiguity, and conclude that the Ima2 symmetry is unstable, and P6¯2m should be realized. The P6¯2m symmetry is also stable in the presence of external hydrostatic pressure. We show that NbReSi with the P6¯2m symmetry should host phonon surface states for (100) and (110) surfaces. Additionally, we discuss the main electronic properties of the system with the stable symmetry.
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36
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Fair R, Jackson A, Voneshen D, Jochym D, Le D, Refson K, Perring T. Euphonic: inelastic neutron scattering simulations from force constants and visualization tools for phonon properties. J Appl Crystallogr 2022; 55:1689-1703. [PMID: 36570656 PMCID: PMC9721333 DOI: 10.1107/s1600576722009256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 09/18/2022] [Indexed: 11/30/2022] Open
Abstract
Interpretation of vibrational inelastic neutron scattering spectra of complex systems is frequently reliant on accompanying simulations from theoretical models. Ab initio codes can routinely generate force constants, but additional steps are required for direct comparison with experimental spectra. On modern spectrometers this is a computationally expensive task due to the large data volumes collected. In addition, workflows are frequently cumbersome as the simulation software and experimental data analysis software often do not easily interface to each other. Here a new package, Euphonic, is presented. Euphonic is a robust, easy to use and computationally efficient tool designed to be integrated into experimental software and able to interface directly with the force constant matrix output of ab initio codes.
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Affiliation(s)
- Rebecca Fair
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK,Correspondence e-mail:
| | - Adam Jackson
- Scientific Computing Department, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
| | - David Voneshen
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK,Department of Physics, Royal Holloway University of London, Egham TW20 0EX, UK
| | - Dominik Jochym
- Scientific Computing Department, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
| | - Duc Le
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
| | - Keith Refson
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
| | - Toby Perring
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
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37
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Li M, Zhou Y, Zhang K, Xu G, Gu G, Su F, Chen X. Pressure Evolution of Ultrafast Photocarrier Dynamics and Electron-Phonon Coupling in FeTe 0.5Se 0.5. Materials (Basel) 2022; 15:8467. [PMID: 36499961 PMCID: PMC9736001 DOI: 10.3390/ma15238467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/21/2022] [Accepted: 11/23/2022] [Indexed: 06/17/2023]
Abstract
Understanding the coupling between electrons and phonons in iron chalcogenides FeTexSe1-x has remained a critical but arduous project in recent decades. The direct observation of the electron-phonon coupling effect through electron dynamics and vibrational properties has been lacking. Here, we report the first pressure-dependent ultrafast photocarrier dynamics and Raman scattering studies on an iron chalcogenide FeTe0.5Se0.5 to explore the interaction between electrons and phonons in this unconventional superconductor. The lifetime of the excited electrons evidently decreases as the pressure increases from 0 to 2.2 GPa, and then increases with further compression. The vibrational properties of the A1g phonon mode exhibit similar behavior, with a pronounced frequency reduction appearing at approximately 2.3 GPa. The dual evidence reveals the enhanced electron-phonon coupling strength with pressure in FeTe0.5Se0.5. Our results give an insight into the role of the electron-phonon coupling effect in iron-based superconductors.
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Affiliation(s)
- Muyun Li
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
- Shanghai Insititude of Space Power Source, Shanghai 200245, China
| | - Yan Zhou
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Kai Zhang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
| | - Guangyong Xu
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Genda Gu
- Condensed Matter Physics & Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Fuhai Su
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
| | - Xiaojia Chen
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
- School of Science, Harbin Institute of Technology, Shenzhen 518055, China
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38
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Pandit A, Hamad B. Anharmonic lattice dynamics and structural phase transition of SnTe monolayer from first principles. J Phys Condens Matter 2022; 51:035401. [PMID: 36327452 DOI: 10.1088/1361-648x/aca001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 11/03/2022] [Indexed: 06/16/2023]
Abstract
In this work we investigate the role of quartic anharmonicity on the lattice- and thermo-dynamic properties of rectangular (γ) and square (β) phases of two-dimensional (2D) SnTe monolayer (ML) by using self-consistent phonon (SCP) theory, based on the first-principles calculations. For both phases, as compared to the usual harmonic approximation (HA), the renormalized phonon frequency at the optical modes (4-10) is found to be increased upon the inclusion of quartic anharmonicity via the SCP method, where the effects of cubic anharmonicity are neglected. At the experimentally observed transition temperature (Tc= 270 K), the difference in the vibrational free-energy between the square and rectangular phases of SnTe ML, calculated by using the anharmonic SCP correction is found to be much closer to the structural energy gain as compared to that obtained by using only the quasi-harmonic contribution. This validates the significance of SCP approach over the HA to explain the lattice dynamics properties and predict theTcfor SnTe ML and similar 2D compounds. The calculated lattice thermal conductivity of square SnTe ML (e.g. 10.67 W m-1K-1at 300 K) is higher than that of the rectangular SnTe ML (e.g. 6.72 W m-1K-1at 300 K) due to the relatively higher corresponding thermodynamic parameters: specific heat capacity, group velocity, and phonon lifetime obtained for the square SnTe ML. Particularly, the low energy phonon modes are found to transport most of the heat in the system and, hence, played major role to the total lattice thermal conductivity.
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Affiliation(s)
- Abhiyan Pandit
- Physics Department, University of Arkansas, Fayetteville, AR 72701, United States of America
| | - Bothina Hamad
- Physics Department, University of Arkansas, Fayetteville, AR 72701, United States of America
- Physics Department, The University of Jordan, Amman 11942, Jordan
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39
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Esfarjani K, Liang Y. Equilibrium and Non-Equilibrium Lattice Dynamics of Anharmonic Systems. Entropy (Basel) 2022; 24:1585. [PMID: 36359675 PMCID: PMC9689135 DOI: 10.3390/e24111585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 10/26/2022] [Accepted: 10/30/2022] [Indexed: 06/16/2023]
Abstract
In this review, motivated by the recent interest in high-temperature materials, we review our recent progress in theories of lattice dynamics in and out of equilibrium. To investigate thermodynamic properties of anharmonic crystals, the self-consistent phonon theory was developed, mainly in the 1960s, for rare gas atoms and quantum crystals. We have extended this theory to investigate the properties of the equilibrium state of a crystal, including its unit cell shape and size, atomic positions and lattice dynamical properties. Using the equation-of-motion method combined with the fluctuation-dissipation theorem and the Donsker-Furutsu-Novikov (DFN) theorem, this approach was also extended to investigate the non-equilibrium case where there is heat flow across a junction or an interface. The formalism is a classical one and therefore valid at high temperatures.
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Affiliation(s)
- Keivan Esfarjani
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA 22904, USA
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA 22904, USA
- Department of Physics, University of Virginia, Charlottesville, VA 22904, USA
| | - Yuan Liang
- Department of Physics, University of Virginia, Charlottesville, VA 22904, USA
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40
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Sekerbayev K, Taurbayev Y, Mussabek G, Baktygerey S, Pokryshkin NS, Yakunin VG, Utegulov Z, Timoshenko VY. Size-Dependent Phonon-Assisted Anti-Stokes Photoluminescence in Nanocrystals of Organometal Perovskites. Nanomaterials (Basel) 2022; 12:3184. [PMID: 36144972 PMCID: PMC9501349 DOI: 10.3390/nano12183184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 09/05/2022] [Accepted: 09/08/2022] [Indexed: 06/16/2023]
Abstract
Anti-Stokes photoluminescence (ASPL), which is an up-conversion phonon-assisted process of the radiative recombination of photoexcited charge carriers, was investigated in methylammonium lead bromide (MALB) perovskite nanocrystals (NCs) with mean sizes that varied from about 6 to 120 nm. The structure properties of the MALB NCs were investigated by means of the scanning and transmission electron microscopy, X-ray diffraction and Raman spectroscopy. ASPL spectra of MALB NCs were measured under near-resonant laser excitation with a photon energy of 2.33 eV and they were compared with the results of the photoluminescence (PL) measurements under non-resonant excitation at 3.06 eV to reveal a contribution of phonon-assisted processes in ASPL. MALB NCs with a mean size of about 6 nm were found to demonstrate the most efficient ASPL, which is explained by an enhanced contribution of the phonon absorption process during the photoexcitation of small NCs. The obtained results can be useful for the application of nanocrystalline organometal perovskites in optoelectronic and all-optical solid-state cooling devices.
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Affiliation(s)
- Kairolla Sekerbayev
- Institute of Experimental and Theoretical Physics, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
- Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, Kazakhstan
| | - Yerzhan Taurbayev
- Institute of Experimental and Theoretical Physics, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
| | - Gauhar Mussabek
- Institute of Experimental and Theoretical Physics, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
- Institute of Information and Computational Technologies, 125, Pushkin Str., Almaty 050000, Kazakhstan
| | - Saule Baktygerey
- Institute of Experimental and Theoretical Physics, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
- Institute of Information and Computational Technologies, 125, Pushkin Str., Almaty 050000, Kazakhstan
| | - Nikolay S. Pokryshkin
- Phys-Bio Institute, University “MEPhI”, 115409 Moscow, Russia
- Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Valery G. Yakunin
- Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Zhandos Utegulov
- Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, Kazakhstan
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41
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Rajaji V, Manjón FJ, Narayana C. Pressure induced topological and topological crystalline insulators. J Phys Condens Matter 2022; 34:423001. [PMID: 35952626 DOI: 10.1088/1361-648x/ac8906] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 08/11/2022] [Indexed: 06/15/2023]
Abstract
Research on topological and topological crystalline insulators (TCIs) is one of the most intense and exciting topics due to its fascinating fundamental science and potential technological applications. Pressure (strain) is one potential pathway to induce the non-trivial topological phases in some topologically trivial (normal) insulating or semiconducting materials. In the last ten years, there have been substantial theoretical and experimental efforts from condensed-matter scientists to characterize and understand pressure-induced topological quantum phase transitions (TQPTs). In particular, a promising enhancement of the thermoelectric performance through pressure-induced TQPT has been recently realized; thus evidencing the importance of this subject in society. Since the pressure effect can be mimicked by chemical doping or substitution in many cases, these results have opened a new route to develop more efficient materials for harvesting green energy at ambient conditions. Therefore, a detailed understanding of the mechanism of pressure-induced TQPTs in various classes of materials with spin-orbit interaction is crucial to improve their properties for technological implementations. Hence, this review focuses on the emerging area of pressure-induced TQPTs to provide a comprehensive understanding of this subject from both theoretical and experimental points of view. In particular, it covers the Raman signatures of detecting the topological transitions (under pressure), some of the important pressure-induced topological and TCIs of the various classes of spin-orbit coupling materials, and provide future research directions in this interesting field.
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Affiliation(s)
- V Rajaji
- University Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560 064, India
- School of Advance Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560 064, India
| | - F J Manjón
- Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team, Universitat Politècnica de València, 46022 Valencia, Spain
| | - Chandrabhas Narayana
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560 064, India
- School of Advance Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560 064, India
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42
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Chen L, Boulanger ME, Wang ZC, Tafti F, Taillefer L. Large phonon thermal Hall conductivity in the antiferromagnetic insulator Cu 3TeO 6. Proc Natl Acad Sci U S A 2022; 119:e2208016119. [PMID: 35969770 DOI: 10.1073/pnas.2208016119] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Phonons are believed not to be able to generate a thermal Hall signal due to their lack of charge or spin. However, since the first discovery of a phonon thermal Hall effect in the paramagnetic insulator Tb3Ga5O12, much larger signals have been observed in several other families of insulators, which raises a fundamental question: How can phonons become chiral in a magnetic field? Most of the insulators that exhibit a phonon Hall effect have some special feature, believed to be a key to the underlying mechanism. Here, our discovery of a large phonon thermal Hall conductivity in a simple material with none of the special features of the previous cases opens up the subject into a much broader question. Phonons are known to generate a thermal Hall effect in certain insulators, including oxides with rare-earth impurities, quantum paraelectrics, multiferroic materials, and cuprate Mott insulators. In each case, a special feature of the material is presumed relevant for the underlying mechanism that confers chirality to phonons in a magnetic field. A fundamental question is whether a phonon Hall effect is an unusual occurrence—linked to special characteristics such as skew scattering off rare-earth impurities, structural domains, ferroelectricity, or ferromagnetism—or a much more common property of insulators than hitherto believed. To help answer this question, we have turned to a material with none of the previously encountered special features: the cubic antiferromagnet Cu3TeO6. We find that its thermal Hall conductivity κxy is among the largest of any insulator so far. We show that this record-high κxy signal is due to phonons, and it does not require the presence of magnetic order, as it persists above the ordering temperature. We conclude that the phonon Hall effect is likely to be a fairly common property of solids.
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43
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Wu X, McEleney CA, Shi Z, González-Jiménez M, Macêdo R. Asymmetric Reflection Induced in Reciprocal Hyperbolic Materials. ACS Photonics 2022; 9:2774-2782. [PMID: 35996366 PMCID: PMC9389604 DOI: 10.1021/acsphotonics.2c00551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Indexed: 06/15/2023]
Abstract
Reflection is one of the most fundamental properties of light propagation. The ability to engineer this property can be a powerful tool when constructing a variety of now ubiquitous optical and electronic devices, including one-way mirrors and antennas. Here, we show from both experimental and theoretical evidence that highly asymmetric reflection can be induced in reciprocal hyperbolic materials. This asymmetry stems from the asymmetric cross-polarization conversion between two linearly polarized waves, an intrinsic and more exotic property of hyperbolic media that is bereft of research. In addition to angle-controllable reflection, our findings suggest that optical devices could utilize the polarization of the incident beam, or even the polarization of the output wave, to engineer functionality; additionally, in hyperbolic slabs or films, the asymmetry can be tailored by controlling the thickness of the material. Such phenomena are key for directional-dependent optical and optoelectronic devices.
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Affiliation(s)
- Xiaohu Wu
- Shandong
Institute of Advanced Technology, Jinan 250100, Shandong, China
| | - Cameron A. McEleney
- James
Watt School of Engineering, Electronics and Nanoscale Engineering
Division, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Zhangxing Shi
- Shandong
Institute of Advanced Technology, Jinan 250100, Shandong, China
| | | | - Rair Macêdo
- James
Watt School of Engineering, Electronics and Nanoscale Engineering
Division, University of Glasgow, Glasgow G12 8QQ, United Kingdom
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44
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Khan S, Angeles F, Wright J, Vishwakarma S, Ortiz VH, Guzman E, Kargar F, Balandin AA, Smith DJ, Jena D, Xing HG, Wilson R. Properties for Thermally Conductive Interfaces with Wide Band Gap Materials. ACS Appl Mater Interfaces 2022; 14:36178-36188. [PMID: 35895030 PMCID: PMC9376929 DOI: 10.1021/acsami.2c01351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 07/13/2022] [Indexed: 06/15/2023]
Abstract
The goal of this study is to determine how bulk vibrational properties and interfacial structure affect thermal transport at interfaces in wide band gap semiconductor systems. Time-domain thermoreflectance measurements of thermal conductance G are reported for interfaces between nitride metals and group IV (diamond, SiC, Si, and Ge) and group III-V (AlN, GaN, and cubic BN) materials. Group IV and group III-V semiconductors have systematic differences in vibrational properties. Similarly, HfN and TiN are also vibrationally distinct from each other. Therefore, comparing G of interfaces formed from these materials provides a systematic test of how vibrational similarity between two materials affects interfacial transport. For HfN interfaces, we observe conductances between 140 and 300 MW m-2 K-1, whereas conductances between 200 and 800 MW m-2 K-1 are observed for TiN interfaces. TiN forms exceptionally conductive interfaces with GaN, AlN, and diamond, that is, G > 400 MW m-2 K-1. Surprisingly, interfaces formed between vibrationally similar and dissimilar materials are similarly conductive. Thus, vibrational similarity between two materials is not a necessary requirement for high G. Instead, the time-domain thermoreflectance experiment (TDTR) data, an analysis of bulk vibrational properties, and transmission electron microscopy (TEM) suggest that G depends on two other material properties, namely, the bulk phonon properties of the vibrationally softer of the two materials and the interfacial structure. To determine how G depends on interfacial structure, TDTR and TEM measurements were conducted on a series of TiN/AlN samples prepared in different ways. Interfacial disorder at a TiN/AlN interface adds a thermal resistance equivalent to ∼1 nm of amorphous material. Our findings improve fundamental understanding of what material properties are most important for thermally conductive interfaces. They also provide benchmarks for the thermal conductance of interfaces with wide band gap semiconductors.
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Affiliation(s)
- Samreen Khan
- University
of California Riverside, Riverside, California 92521, United States
| | - Frank Angeles
- University
of California Riverside, Riverside, California 92521, United States
| | - John Wright
- Cornell
University, Ithaca, New York 14850, United
States
| | | | - Victor H. Ortiz
- University
of California Riverside, Riverside, California 92521, United States
| | - Erick Guzman
- University
of California Riverside, Riverside, California 92521, United States
| | - Fariborz Kargar
- University
of California Riverside, Riverside, California 92521, United States
| | | | - David J. Smith
- Arizona
State University, Tempe, Arizona 85287, United
States
| | - Debdeep Jena
- Cornell
University, Ithaca, New York 14850, United
States
| | - H. Grace Xing
- Cornell
University, Ithaca, New York 14850, United
States
| | - Richard Wilson
- University
of California Riverside, Riverside, California 92521, United States
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45
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Bouchet J, Bottin F, Antonangeli D, Morard G. Sound velocities and thermodynamical properties of hcp iron at high pressure and temperature. J Phys Condens Matter 2022; 34:344002. [PMID: 35705075 DOI: 10.1088/1361-648x/ac792f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 06/15/2022] [Indexed: 06/15/2023]
Abstract
Sound velocities and thermodynamical properties of hcp iron have been computed usingab initiocalculations over an extended density and temperature range, encompassing the conditions directly relevant for the Earth's inner core. At room temperature, and up to 350 GPa, an excellent agreement is obtained between present results and experimental data for many thermodynamical quantities: phonon density of states, vibrational entropy, heat capacity, Grüneisen parameter and thermal expansion. With increasing temperature, along an isochore, we observe a strong decrease of the phonon frequencies, demonstrating that intrinsic anharmonic effects cannot be neglected. We also carefully compare previous theoretical data for the sound velocities and try to explain the discrepancies observed with experiments. Finally, we propose a temperature dependant Birch's law that we compare with previous experimental work.
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Affiliation(s)
- J Bouchet
- CEA, DES, IRESNE, DEC, F-13108 Saint-Paul-Lez-Durance, France
- CEA, DAM, DIF, F-91297 Arpajon, France, and Université Paris-Saclay, CEA, Laboratoires des Matériaux en Conditions Extreêmes, 91680 Bruyères-le-Châtel, France
| | - F Bottin
- CEA, DAM, DIF, F-91297 Arpajon, France, and Université Paris-Saclay, CEA, Laboratoires des Matériaux en Conditions Extreêmes, 91680 Bruyères-le-Châtel, France
| | - D Antonangeli
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, 75005 Paris, France
| | - G Morard
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, 75005 Paris, France
- Université Grenoble Alpes, CNRS, IRD, IFSTTAR, ISTerre, Grenoble 38000, France
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46
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Neufeld O, Zhang J, De Giovannini U, Hübener H, Rubio A. Probing phonon dynamics with multidimensional high harmonic carrier-envelope-phase spectroscopy. Proc Natl Acad Sci U S A 2022; 119:e2204219119. [PMID: 35704757 DOI: 10.1073/pnas.2204219119] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
High harmonic generation (HHG) has recently been established as a powerful method for probing ultrafast electron dynamics in solids. However, it remains unknown if HHG can be similarly applied for probing lattice distortions such as phonons. Specifically, it is unclear if the extreme nonlinearity of HHG can contribute to enhanced temporal resolution or sensitivity for probing lattice dynamics (compared to other, perturbative, methods). Here, we theoretically explore HHG in solids with active phonons. We present a pump-probe and multidimensional spectroscopy approach that relies on carrier-envelope-phase-sensitivity, in which HHG is highly sensitive for phonon dynamics. Strikingly, the predicted temporal resolution is ∼1 femtosecond, much below the probe pulse duration, owing to the subcycle nature of the approach. We explore pump-probe high harmonic generation (HHG) from monolayer hexagonal-boron-nitride, where a terahertz pump excites coherent optical phonons that are subsequently probed by an intense infrared pulse that drives HHG. We find, through state-of-the-art ab initio calculations, that the structure of the emission spectrum is attenuated by the presence of coherent phonons and no longer comprises discrete harmonic orders, but rather a continuous emission in the plateau region. The HHG yield strongly oscillates as a function of the pump-probe delay, corresponding to ultrafast changes in the lattice such as specific bond compression or stretching dynamics. We further show that in the regime where the excited phonon period and the pulse duration are of the same order of magnitude, the HHG process becomes sensitive to the carrier-envelope phase (CEP) of the driving field, even though the pulse duration is so long that no such sensitivity is observed in the absence of coherent phonons. The degree of CEP sensitivity versus pump-probe delay is shown to be a highly selective measure for instantaneous structural changes in the lattice, providing an approach for ultrafast multidimensional HHG spectroscopy. Remarkably, the obtained temporal resolution for phonon dynamics is ∼1 femtosecond, which is much shorter than the probe pulse duration because of the inherent subcycle contrast mechanism. Our work paves the way toward routes of probing phonons and ultrafast material structural changes with subcycle temporal resolution and provides a mechanism for controlling the HHG spectrum.
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Fuentes-Domínguez R, Naznin S, La Cavera III S, Cousins R, Pérez-Cota F, Smith RJ, Clark M. Polarization-Sensitive Super-Resolution Phononic Reconstruction of Nanostructures. ACS Photonics 2022; 9:1919-1925. [PMID: 35726241 PMCID: PMC9204812 DOI: 10.1021/acsphotonics.1c01607] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Indexed: 05/28/2023]
Abstract
In this paper, we show for the first time the polarization-sensitive super-resolution phononic reconstruction of multiple nanostructures in a liquid environment by overcoming the diffraction limit of the optical system (1 μm). By using time-resolved pump-probe spectroscopy, we measure the acoustic signature of nanospheres and nanorods at different polarizations. This enables the size, position, and orientation characterization of multiple nanoparticles in a single point spread function with the precision of 5 nm, 3 nm, and 1.4°, respectively. Unlike electron microscopy where a high vacuum environment is needed for imaging, this technique performs measurements in liquids at ambient pressure, ideal to study the insights of living specimens. This is a potential path toward super-resolution phononic imaging where the acoustic signatures of multiple nanostructures could act as an alternative to fluorescent labels. In this context, phonons also offer the opportunity to extract information about the mechanical properties of the surrounding medium as well as access to subsurface features.
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Affiliation(s)
- Rafael Fuentes-Domínguez
- Optics
and Photonics Group, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Shakila Naznin
- Optics
and Photonics Group, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Salvatore La Cavera III
- Optics
and Photonics Group, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Richard Cousins
- Nanoscale
and Microscale Research Centre, University
of Nottingham, University Park, Nottingham NG7 2RD, United
Kingdom
| | - Fernando Pérez-Cota
- Optics
and Photonics Group, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Richard J. Smith
- Optics
and Photonics Group, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Matt Clark
- Optics
and Photonics Group, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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48
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Sihi A, Pandey SK. Evidence of phase stability, topological phonon and temperature-induced topological phase transition in rocksalt SnS and SnSe. J Phys Condens Matter 2022; 34:325601. [PMID: 35623345 DOI: 10.1088/1361-648x/ac742e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 05/27/2022] [Indexed: 06/15/2023]
Abstract
Both SnS and SnSe have been experimentally and theoretically confirmed as topological crystalline insulators in native rocksalt structure. Here, phononic structure, thermodynamic properties and temperature dependent electron-phonon interaction (EPI) have investigated for both the materials in rocksalt phase. Previously performed theoretical studies have predicted the phase instability of SnS in this crystal structure at ambient condition. But, after a detailed study performing on the phonon calculation of SnS, we have predicted the phase stability of SnS with considering the Sn 4porbitals as valence states inab-initiocalculation. The importance of long range Coulomb forces along with the themodynamical properties are also described in detailed for both materials. The computed value of Debye temperature (ΘD) for SnS (SnSe) is ∼315.0 K (∼201.7 K). The preliminary evidence of topological phonon is found alongX-Wdirection, where the linear band touching is observed as compared to type II Weyl phononic material ZnSe (Liuet al2021Phys. Rev.B103094306). The topological phase transition is seen for these materials due to EPI, where non-linear temperature dependent bandgap is estimated. The predicted value of transition temperature for SnS (SnSe) is found to be ∼700 K, where after this temperature the non-trivial to trivial topological phase is seen. The strength of EPI shows more stronger impact on the electronic structure of SnS than SnSe material. The reason of non-linear behaviour of bandgap with rise in temperature is discussed with the help of temperature dependent linewidths and lineshifts of conduction band and valence band due to EPI. The present study reveals the phase stability of SnS along with the comparative study of thermal effect on EPI of SnS and SnSe. Further, the possibility of temperature induced topological phase transition provides one of important behaviour to apply these two materials for device making application.
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Affiliation(s)
- Antik Sihi
- School of Basic Sciences, Indian Institute of Technology Mandi, Kamand 175075, India
| | - Sudhir K Pandey
- School of Engineering, Indian Institute of Technology Mandi, Kamand 175075, India
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Weseloh MJ, Balédent V, Zheng W, Verseils M, Roy P, Brubach JB, Colson D, Forget A, Foury-Leylekian P, Lepetit MB. Lattice dynamics of BaFe 2Se 3. J Phys Condens Matter 2022; 34:255402. [PMID: 35378521 DOI: 10.1088/1361-648x/ac640d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 04/04/2022] [Indexed: 06/14/2023]
Abstract
This paper presents a study of the lattice dynamics in BaFe2Se3. We combined first-principle calculations, infrared measurements and a thorough symmetry analysis. Our study confirms thatPnmacannot be the space group of BaFe2Se3, even at room temperature. The phonons assignment requiresPmto be the BaFe2Se3space group, not only in the magnetic phase, but also in the paramagnetic phase at room temperature. This is due to a strong coupling between a short-range spin-order along the ladders, and the lattice degrees of freedom associated with the Fe-Fe bond length. This coupling induces a change in the bond-length pattern from an alternated trapezoidal one (as inPnma) to an alternated small/large rectangular one. Out of the two patterns, only the latter is fully compatible with the observed block-type magnetic structure. Finally, we propose a complete symmetry analysis of the BaFe2Se3phase diagram in the 0-600 K range.
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Affiliation(s)
- M J Weseloh
- Institut Néel, CNRS, Université Grenoble Alpes, 25 av. des Martyrs, 38042 Grenoble, France
- Institut Laue-Langevin, 71 av. des Martyrs, 38000 Grenoble, France
| | - V Balédent
- CNRS, Laboratoire de Physique des Solides, Université Paris-Saclay, 91405, Orsay, France
| | - W Zheng
- CNRS, Laboratoire de Physique des Solides, Université Paris-Saclay, 91405, Orsay, France
| | - M Verseils
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif-sur-Yvette, France
| | - P Roy
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif-sur-Yvette, France
| | - J B Brubach
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif-sur-Yvette, France
| | - D Colson
- SPEC, CEA, CNRS-UMR3680, Université Paris-Saclay, Gif-sur-Yvette Cedex 91191, France
| | - A Forget
- SPEC, CEA, CNRS-UMR3680, Université Paris-Saclay, Gif-sur-Yvette Cedex 91191, France
| | - P Foury-Leylekian
- CNRS, Laboratoire de Physique des Solides, Université Paris-Saclay, 91405, Orsay, France
| | - M-B Lepetit
- Institut Néel, CNRS, Université Grenoble Alpes, 25 av. des Martyrs, 38042 Grenoble, France
- Institut Laue-Langevin, 71 av. des Martyrs, 38000 Grenoble, France
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50
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Andharia E, Alqurashi H, Hamad B. Lattice Dynamics, Mechanical Properties, Electronic Structure and Magnetic Properties of Equiatomic Quaternary Heusler Alloys CrTiCoZ (Z = Al, Si) Using First Principles Calculations. Materials (Basel) 2022; 15:3128. [PMID: 35591462 DOI: 10.3390/ma15093128] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 03/28/2022] [Accepted: 04/20/2022] [Indexed: 02/04/2023]
Abstract
First principles calculations are performed to investigate the thermodynamical stability, dynamical, mechanical, electronic and magnetic properties of CrTiCoZ (Z = Al/Si) novel quaternary Heusler alloys. A Y-type III atomic configuration is found to be the most stable structure for both compounds. The lattice constant values obtained using GGA-PBE approach are 5.9368 Å and 5.7853 Å for CrTiCoAl and CrTiCoSi, respectively. Using the value of elastic moduli for both the compounds, the computed Pugh’s ratio value is 2.5 and 2.7 for CrTiCoAl and CrTiCoSi, respectively, which is higher than 1.75, indicating both the compounds are ductile in nature. The melting temperatures of both compounds are as high as 2142 K and 2420 K for CrTiCoAl and CrTiCoSi, respectively. The electronic structure calculations, using the GGA-PBE approach, show a half metallic behavior of CrTiCoAl. The spin-down channel exhibits a direct band gap of 0.15 eV, whereas the spin-up channel is metallic, making CrTiCoAl a half metallic ferromagnet with 100% spin polarization and an appreciable magnetic moment of −2 μB. However, CrTiCoSi is found to be semi-metallic in the spin-down channel and metallic in the spin-up channel, which leads to a spin polarization of 99.7% with a non-integer magnetic moment of −0.99 μB. The Curie temperature of CrTiCoAl is well above the room temperature (385 K), whereas that of CrTiCoSi is below the room temperature (203 K). Thus, CrTiCoAl is found to be more promising than CrTiCoSi as a spin injector in spintronic devices.
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