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Tsuppayakorn-aek P, Luo W, Ahuja R, Bovornratanaraks T. Phonon-mediated superconductivity in [Formula: see text] compounds: a crystal prediction via cluster expansion and particle-swarm optimization. Sci Rep 2023; 13:20295. [PMID: 37985841 PMCID: PMC10662459 DOI: 10.1038/s41598-023-44632-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 10/10/2023] [Indexed: 11/22/2023] Open
Abstract
Investigating superconductivity represents one of the most significant phenomena in the field of condensed matter physics. Our simulations aim to elucidate the structures in the metallic state of Mg1-xMoxB2, which is essential for predicting their superconducting properties. By employing a first-principle cluster expansion and particle-swarm optimization, we have predicted the structures of Mg1-xMoxB2 ternary alloys, including Mg0.667Mo0.333B2, Mg0.5Mo0.5B2, and Mg0.333Mo0.667B2, and have determined their thermodynamically stable configurations under both atmospheric and high-pressure conditions. To investigate the potential for superconductivity in these structures, we have conducted a detailed examination of electronic properties that are pertinent to determining the superconducting state. Regarding superconducting properties, Mg0.333Mo0.667B2 exhibits superconductivity with a critical temperature (Tc) of 7.4 K at ambient pressure. These findings suggest that the theoretically predicted structures in Mg/Mo-substituted metal borides could play a significant role in synthesis and offer valuable insights into superconducting materials.
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Affiliation(s)
- Prutthipong Tsuppayakorn-aek
- Extreme Conditions Physics Research Laboratory and Center of Excellence in Physics of Energy Materials (CE:PEM), Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
| | - Wei Luo
- Condensed Matter Theory Group, Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
| | - Rajeev Ahuja
- Condensed Matter Theory Group, Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
- Department of Physics, Indian Institute of Technology (IIT) Ropar, Rupnagar, Punjab 140001 India
| | - Thiti Bovornratanaraks
- Extreme Conditions Physics Research Laboratory and Center of Excellence in Physics of Energy Materials (CE:PEM), Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
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2
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Barbosa MC, da Silva EL, Lekshmi PN, Marcondes ML, Assali LVC, Petrilli HM, Lopes AML, Araújo JP. Pressure-Induced Phase Transformations of Quasi-2D Sr 3Hf 2O 7. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:15435-15442. [PMID: 37706058 PMCID: PMC10497066 DOI: 10.1021/acs.jpcc.3c01596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 06/07/2023] [Indexed: 09/15/2023]
Abstract
We present an abinitio study of the quasi-2D layered perovskite Sr3Hf2O7 compound, performed within the framework of the density functional theory and lattice dynamics analysis. At high temperatures, this compound takes a I4/mmm centrosymmetric structure (S.G. n. 139); as the temperature is lowered, the symmetry is broken into other intermediate polymorphs before reaching the ground-state structure, which is the Cmc21 ferroelectric phase (S.G. n. 36). One of these intermediate polymorphs is the Ccce structural phase (S.G. n. 68). Additionally, we have probed the C2/c system (S.G n. 15), which was obtained by following the atomic displacements corresponding to the eigenvectors of the imaginary frequency mode localized at the Γ-point of the Ccce phase. By observing the enthalpies at low pressures, we found that the Cmc21 phase is thermodynamically the most stable. Our results show that the I4/mmm and C2/c phases never stabilize in the 0-20 GPa range of pressure values. On the other hand, the Ccce phase becomes energetically more stable at around 17 GPa, surpassing the Cmc21 structure. By considering the effect of entropy and the constant-volume free energies, we observe that the Cmc21 polymorph is energetically the most stable phase at low temperature; however, at 350 K, the Ccce system becomes the most stable. By probing the volume-dependent free energies at 19 GPa, we see that Ccce is always the most stable phase between the two structures and also throughout the studied temperature range. When analyzing the phonon dispersion frequencies, we conclude that the Ccce system becomes dynamically stable only around 19-20 GPa and that the Cmc21 phase is metastable up to 30 GPa.
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Affiliation(s)
- M. C.
B. Barbosa
- IFIMUP,
Institute of Physics for Advanced Materials, Nanotechnology and Photonics,
Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - E. Lora da Silva
- IFIMUP,
Institute of Physics for Advanced Materials, Nanotechnology and Photonics,
Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
- High
Performance Computing Chair, University
of Évora, Largo
dos Colegiais 2, 7004-516 Évora, Portugal
| | - P. Neenu Lekshmi
- IFIMUP,
Institute of Physics for Advanced Materials, Nanotechnology and Photonics,
Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - M. L. Marcondes
- Instituto
de Física, Universidade de São
Paulo, Rua do Matao 1371, 05508-090 São Paulo, SP, Brazil
| | - L. V. C. Assali
- Instituto
de Física, Universidade de São
Paulo, Rua do Matao 1371, 05508-090 São Paulo, SP, Brazil
| | - H. M. Petrilli
- Instituto
de Física, Universidade de São
Paulo, Rua do Matao 1371, 05508-090 São Paulo, SP, Brazil
| | - A. M. L. Lopes
- IFIMUP,
Institute of Physics for Advanced Materials, Nanotechnology and Photonics,
Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - J. P. Araújo
- IFIMUP,
Institute of Physics for Advanced Materials, Nanotechnology and Photonics,
Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
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Tsuppayakorn-aek P, Sukmas W, Pluengphon P, Inceesungvorn B, Phansuke P, Kaewtubtim P, Ahuja R, Bovornratanaraks T, Luo W. Lattice dynamic stability and electronic structures of ternary hydrides La 1−xY xH 3via first-principles cluster expansion. RSC Adv 2022; 12:26808-26814. [PMID: 36320850 PMCID: PMC9490771 DOI: 10.1039/d2ra03194a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 08/08/2022] [Indexed: 12/30/2022] Open
Abstract
Lanthanum hydride compounds LaH3 become stabilized by yttrium substitution under the influence of moderate pressure. Novel materials with a wide range of changes in the structural properties as a function of hydrogen are investigated by means of the first-principles cluster expansion technique. Herein, the new compounds La1−xYxH3, where 0 ≤ x ≤ 1, are determined to adopt tetragonal structures under high-pressure with the compositions La0.8Y0.2H3, La0.75Y0.25H3, and La0.5Y0.5H3. The corresponding thermodynamic and dynamical stabilities of the predicted phases are confirmed by a series of calculations including, for example, phonon dispersion, electronic band structure, and other electronic characteristics. According to the band characteristics, all hydrides except that of I41/amd symmetry are semiconductors. The tetragonal La0.5Y0.5H3 phase is found to become semi-metallic, as confirmed by adopting the modified Becke–Johnson exchange potential. The physical origins of the semiconductor properties in these stable hydrides are discussed in detail. Our findings provide a deeper insight into this class of rare-earth ternary hydrides. Lanthanum hydride compound LaH3 become stabilized by yttrium substitution under the influence of moderate pressure.![]()
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Affiliation(s)
- Prutthipong Tsuppayakorn-aek
- Extreme Conditions Physics Research Laboratory and Center of Excellence in Physics of Energy Materials (CE:PEM), Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
- Thailand Center of Excellence in Physics, Ministry of Higher Education, Science, Research and Innovation, 328 Si Ayutthaya Road, Bangkok 10400, Thailand
| | - Wiwittawin Sukmas
- Extreme Conditions Physics Research Laboratory and Center of Excellence in Physics of Energy Materials (CE:PEM), Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
- Thailand Center of Excellence in Physics, Ministry of Higher Education, Science, Research and Innovation, 328 Si Ayutthaya Road, Bangkok 10400, Thailand
| | - Prayoonsak Pluengphon
- Division of Physical Science, Faculty of Science and Technology, Huachiew Chalermprakiet University, Samutprakarn 10540, Thailand
| | - Burapat Inceesungvorn
- Department of Chemistry, Center of Excellence in Materials Science and Technology and Materials Science Research Centre, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Piya Phansuke
- Department of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand
| | - Pungtip Kaewtubtim
- Department of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand
| | - Rajeev Ahuja
- Materials Theory, Department of Physics and Materials Science, Uppsala University, Box 530, SE-751 21, Uppsala, Sweden
- Department of Physics, Indian Institute of Technology (IIT) Ropar, Rupnagar 140001, Punjab, India
| | - Thiti Bovornratanaraks
- Extreme Conditions Physics Research Laboratory and Center of Excellence in Physics of Energy Materials (CE:PEM), Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
- Thailand Center of Excellence in Physics, Ministry of Higher Education, Science, Research and Innovation, 328 Si Ayutthaya Road, Bangkok 10400, Thailand
| | - Wei Luo
- Materials Theory, Department of Physics and Materials Science, Uppsala University, Box 530, SE-751 21, Uppsala, Sweden
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Schwarz U, Kasinathan D, Bergner C, Hunger J, Meier-Kircher K, Akselrud L, Hanfland M, Mezouar M, Glazyrin K, Stinton GW, Husband R, Rosner H, McMahon MI. Distortions in the cubic primitive high-pressure phases of calcium. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:065401. [PMID: 30523800 DOI: 10.1088/1361-648x/aaf49b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The superconductivity in highly compressed calcium involves the occurrence of closely related low-symmetry structural patterns with an exceptionally low coordination number. Earlier theoretical and experimental results are controversial and some findings are inconsistent with our later observations in the pressure range up to 60 GPa. This situation motivated the present concerted computational and experimental re-investigation of the structural arrangement of calcium slightly above the high-pressure limit of the bcc arrangement at low-temperatures. We report here reproducible experimental evidence for a monoclinic distortion (mC4, space group C2/c) of the calcium polymorph previously assigned to the tetragonal β-Sn structure type. In accordance, the enthalpies calculated by electronic band structure calculations show the mC4 phase to be more stable than the undistorted β-Sn type by about 100 meV in the entire phase space. The other low-temperature phase of calcium adopts space group Cmcm (oC4) rather than the earlier assigned Cmmm symmetry. These structural alterations substantially effect the density of states at the Fermi level and, thus, the electronic properties.
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Affiliation(s)
- Ulrich Schwarz
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, D-01187 Dresden, Germany
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Impact of Coulomb Correlations on Magnetic Anisotropy in Mn 3Ga Ferrimagnet. Sci Rep 2017; 7:13221. [PMID: 29038568 PMCID: PMC5643519 DOI: 10.1038/s41598-017-13276-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 09/19/2017] [Indexed: 11/08/2022] Open
Abstract
Traditional density functional theory (DFT) miserably fails to reproduce the experimental volume and magnetic anisotropy of D022 Mn3Ga, which has recently become one of the most sought-after materials in order to achieve a stable spin switching at low current density. Despite great progress over the last 10 years, this issue has hitherto remained unsolved. Here, taking into account the effects of strong electronic correlations beyond what is included in standard DFT, we show by comparison with the experiment that the DFT+U method is capable of quantitatively describing the volume and the magnetic anisotropy energy (MAE) in this alloy with physically meaningful choice of onsite Coulomb-U parameter. For the first time using a plane-wave code, we decompose MAE into spin channel-resolved components in order to determine spin-flip and spin-conserving contributions. The Mn atom at the tetrahedral site is identified as the primary source of the high perpendicular MAE with the most dominant spin-orbit coupling (SOC) occurring between its two orbital pairs: ↑↑ coupling and ↓↓ coupling between [Formula: see text] and d xy , and ↑↓ coupling between d yz and [Formula: see text]. Using the SOC-perturbation theory model, we provide interpretation of our numerical results. These results are important for quantitative microscopic understanding of the large perpendicular MAE observed in this material, and should assist in harnessing its potential for applications in futuristic spintronic devices.
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