201
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Chen W, Semenok DV, Huang X, Shu H, Li X, Duan D, Cui T, Oganov AR. High-Temperature Superconducting Phases in Cerium Superhydride with a T_{c} up to 115 K below a Pressure of 1 Megabar. PHYSICAL REVIEW LETTERS 2021; 127:117001. [PMID: 34558917 DOI: 10.1103/physrevlett.127.117001] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Accepted: 07/30/2021] [Indexed: 05/25/2023]
Abstract
The discoveries of high-temperature superconductivity in H_{3}S and LaH_{10} have excited the search for superconductivity in compressed hydrides, finally leading to the first discovery of a room-temperature superconductor in a carbonaceous sulfur hydride. In contrast to rapidly expanding theoretical studies, high-pressure experiments on hydride superconductors are expensive and technically challenging. Here, we experimentally discovered superconductivity in two new phases, Fm3[over ¯]m-CeH_{10} (SC-I phase) and P6_{3}/mmc-CeH_{9} (SC-II phase) at pressures that are much lower (<100 GPa) than those needed to stabilize other polyhydride superconductors. Superconductivity was evidenced by a sharp drop of the electrical resistance to zero and decreased critical temperature in deuterated samples and in external magnetic field. SC-I has T_{c}=115 K at 95 GPa, showing an expected decrease in further compression due to the decrease of the electron-phonon coupling (EPC) coefficient λ (from 2.0 at 100 GPa to 0.8 at 200 GPa). SC-II has T_{c}=57 K at 88 GPa, rapidly increasing to a maximum T_{c}∼100 K at 130 GPa, and then decreasing in further compression. According to the theoretical calculation, this is due to a maximum of λ at the phase transition from P6_{3}/mmc-CeH_{9} into a symmetry-broken modification C2/c-CeH_{9}. The pressure-temperature conditions of synthesis affect the actual hydrogen content and the actual value of T_{c}. Anomalously low pressures of stability of cerium superhydrides make them appealing for studies of superhydrides and for designing new superhydrides with stability at even lower pressures.
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Affiliation(s)
- Wuhao Chen
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Dmitrii V Semenok
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, Bolshoy Boulevard 30, bldg. 1 Moscow, Russia 121205
| | - Xiaoli Huang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Haiyun Shu
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Xin Li
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Defang Duan
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Tian Cui
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Artem R Oganov
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, Bolshoy Boulevard 30, bldg. 1 Moscow, Russia 121205
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202
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Lin C, Tse JS. High-Pressure Nonequilibrium Dynamics on Second-to-Microsecond Time Scales: Application of Time-Resolved X-ray Diffraction and Dynamic Compression in Ice. J Phys Chem Lett 2021; 12:8024-8038. [PMID: 34402625 DOI: 10.1021/acs.jpclett.1c01623] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The study of nonequilibrium transition dynamics on structural transformation from the second to microsecond regime, a time scale between static and shock compression, is an emerging field of high-pressure research. There are ample opportunities to uncover novel physical phenomena within this time regime. Herein, we briefly review the development and application of a dynamic compression technique based on a diamond anvil cell (DAC) and time-resolved X-ray diffraction (TRXRD) for the study of time-, pressure-, and temperature-dependent structural dynamics. Applications of the techniques are illustrated with our recent investigations on the mechanisms of the interconversions between different high-pressure ice polymorphs. These examples demonstrate that a combination of dynamic compression and TRXRD is a versatile approach capable of providing information on the kinetics and thermodynamic nature associated with structural transformations. Future improvement of rapid compression and TRXRD techniques and potentially interesting research topics in this area are suggested.
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Affiliation(s)
- Chuanlong Lin
- Center for High-Pressure Science and Technology Advanced Research, Beijing 100094, P.R. China
| | - John S Tse
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
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203
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Kong P, Minkov VS, Kuzovnikov MA, Drozdov AP, Besedin SP, Mozaffari S, Balicas L, Balakirev FF, Prakapenka VB, Chariton S, Knyazev DA, Greenberg E, Eremets MI. Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure. Nat Commun 2021; 12:5075. [PMID: 34417471 PMCID: PMC8379216 DOI: 10.1038/s41467-021-25372-2] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 08/04/2021] [Indexed: 02/07/2023] Open
Abstract
The discovery of superconducting H3S with a critical temperature Tc∼200 K opened a door to room temperature superconductivity and stimulated further extensive studies of hydrogen-rich compounds stabilized by high pressure. Here, we report a comprehensive study of the yttrium-hydrogen system with the highest predicted Tcs among binary compounds and discuss the contradictions between different theoretical calculations and experimental data. We synthesized yttrium hydrides with the compositions of YH3, YH4, YH6 and YH9 in a diamond anvil cell and studied their crystal structures, electrical and magnetic transport properties, and isotopic effects. We found superconductivity in the Im-3m YH6 and P63/mmc YH9 phases with maximal Tcs of ∼220 K at 183 GPa and ∼243 K at 201 GPa, respectively. Fm-3m YH10 with the highest predicted Tc > 300 K was not observed in our experiments, and instead, YH9 was found to be the hydrogen-richest yttrium hydride in the studied pressure and temperature range up to record 410 GPa and 2250 K.
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Affiliation(s)
- Panpan Kong
- Max-Planck-Institut für Chemie, Mainz, Germany
| | | | - Mikhail A Kuzovnikov
- Institute of Solid State Physics Russian Academy of Sciences, Chernogolovka, Moscow District, Russia
| | | | | | - Shirin Mozaffari
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA
| | - Luis Balicas
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA
| | | | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, USA
| | - Stella Chariton
- Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, USA
| | - Dmitry A Knyazev
- Max-Planck-Institut für Mikrostrukturphysik, Halle (Saale), Germany
| | - Eran Greenberg
- Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, USA
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204
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Tsuppayakorn-Aek P, Phaisangittisakul N, Ahuja R, Bovornratanaraks T. High-temperature superconductor of sodalite-like clathrate hafnium hexahydride. Sci Rep 2021; 11:16403. [PMID: 34385486 PMCID: PMC8361170 DOI: 10.1038/s41598-021-95112-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Accepted: 07/21/2021] [Indexed: 12/02/2022] Open
Abstract
Hafnium hydrogen compounds have recently become the vibrant materials for structural prediction at high pressure, from their high potential candidate for high-temperature superconductors. In this work, we predict \documentclass[12pt]{minimal}
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\begin{document}$$\hbox {HfH}_{6}$$\end{document}HfH6 by exploiting the evolutionary searching. A high-pressure phase adopts a sodalite-like clathrate structure, showing the body-centered cubic structure with a space group of \documentclass[12pt]{minimal}
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\begin{document}$$Im\bar{3}m$$\end{document}Im3¯m. The first-principles calculations have been used, including the zero-point energy, to investigate the probable structures up to 600 GPa, and find that the \documentclass[12pt]{minimal}
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\begin{document}$$Im\bar{3}m$$\end{document}Im3¯m structure is thermodynamically and dynamically stable. This remarkable result of the \documentclass[12pt]{minimal}
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\begin{document}$$Im\bar{3}m$$\end{document}Im3¯m structure shows the van Hove singularity at the Fermi level by determining the density of states. We calculate a superconducting transition temperature (\documentclass[12pt]{minimal}
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\begin{document}$$T_{c}$$\end{document}Tc) using Allen-Dynes equation and demonstrated that it exhibits superconductivity under high pressure with relatively high-\documentclass[12pt]{minimal}
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\begin{document}$$T_{c}$$\end{document}Tc of 132 K.
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Affiliation(s)
- Prutthipong Tsuppayakorn-Aek
- Extreme Conditions Physics Research Laboratory (ECPRL) and Physics of Energy Materials Research Unit, Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.,Thailand Centre of Excellence in Physics, Ministry of Higher Education, Science, Research and Innovation, 328 Si Ayutthaya Road, Bangkok, 10400, Thailand
| | - Nakorn Phaisangittisakul
- Extreme Conditions Physics Research Laboratory (ECPRL) and Physics of Energy Materials Research Unit, Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.,Thailand Centre of Excellence in Physics, Ministry of Higher Education, Science, Research and Innovation, 328 Si Ayutthaya Road, Bangkok, 10400, Thailand
| | - Rajeev Ahuja
- Condensed Matter Theory Group, Department of Physics and Materials Science, Uppsala University, Box 530, Uppsala, SE, 751 21, Sweden.,Department of Physics, Indian Institute of Technology (IIT) Ropar, Rupnagar, Punjab, 140001, India
| | - Thiti Bovornratanaraks
- Extreme Conditions Physics Research Laboratory (ECPRL) and Physics of Energy Materials Research Unit, Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand. .,Thailand Centre of Excellence in Physics, Ministry of Higher Education, Science, Research and Innovation, 328 Si Ayutthaya Road, Bangkok, 10400, Thailand.
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205
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Villa-Cortés S, De la Peña-Seaman O. Electron- and hole-doping on ScH 2and YH 2: effects on superconductivity without applied pressure. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:425401. [PMID: 34311454 DOI: 10.1088/1361-648x/ac17ae] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 07/26/2021] [Indexed: 06/13/2023]
Abstract
We present the evolution of the structural, electronic, and lattice dynamical properties, as well as the electron-phonon (el-ph) coupling and superconducting critical temperature (Tc) of ScH2and YH2metal hydrides solid solutions, as a function of the electron- and hole-doping content. The study was performed within the density functional perturbation theory, taking into account the effect of zero-point energy through the quasi-harmonic approximation, and the solid solutions Sc1-xMxH2(M = Ca, Ti) and Y1-xMxH2(M = Sr, Zr) were modeled by the virtual crystal approximation. We have found that, under hole-doping (M = Ca, Sr), the ScH2and YH2hydrides do not improve their el-ph coupling properties, sensed byλ(x). Instead, by electron-doping (M = Ti, Zr), the systems reach a critical contentx≈ 0.5 where the latent coupling is triggered, increasingλas high as 70%, in comparison with itsλ(x= 0) value. Our results show thatTcquickly decreases as a function ofxon the hole-doping region, fromx= 0.2 tox= 0.9, collapsing at the end. Alternatively, for electron-doping,Tcfirst decreases steadily untilx= 0.5, reaching its minimum, but forx> 0.5 it increases rapidly, reaching its maximum value of the entire range at the Sc0.05Ti0.95H2and Y0.2Zr0.8H2solid solutions, demonstrating that electron-doping can improve the superconducting properties of pristine metal hydrides, in the absence of applied pressure.
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Affiliation(s)
- S Villa-Cortés
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, Apartado Postal J-48, 72570, Puebla, México
| | - O De la Peña-Seaman
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, Apartado Postal J-48, 72570, Puebla, México
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206
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Yao S, Wang C, Liu S, Jeon H, Cho JH. Formation Mechanism of Chemically Precompressed Hydrogen Clathrates in Metal Superhydrides. Inorg Chem 2021; 60:12934-12940. [PMID: 34369748 DOI: 10.1021/acs.inorgchem.1c01340] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Recently, the experimental discovery of high-Tc superconductivity in compressed hydrides H3S and LaH10 at megabar pressures has triggered searches for various superconducting superhydrides. It was experimentally observed that thorium superhydrides, ThH10 and ThH9, are stabilized at much lower pressures than LaH10. Based on first-principles density functional theory calculations, we reveal that the isolated Th frameworks of ThH10 and ThH9 have relatively more excess electrons in interstitial regions than the La framework of LaH10. Such interstitial excess electrons easily participate in the formation of the anionic H cage surrounding the metal atom. The resulting Coulomb attraction between cationic Th atoms and anionic H cages is estimated to be stronger than the corresponding one of LaH10, thereby giving rise to larger chemical precompressions in ThH10 and ThH9. Such a formation mechanism of H clathrates can also be applied to other superhydrides such as CeH9, PrH9, and NdH9. Our findings demonstrate that interstitial excess electrons in the isolated metal frameworks of high-pressure superhydrides play an important role in generating the chemical precompression of H clathrates.
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Affiliation(s)
- Shichang Yao
- Department of Physics, Research Institute for Natural Science, and Institute for High Pressure at Hanyang University, Hanyang University, 222 Wangsimni-ro, Seongdong-Ku, Seoul 04763, Republic of Korea
| | - Chongze Wang
- Department of Physics, Research Institute for Natural Science, and Institute for High Pressure at Hanyang University, Hanyang University, 222 Wangsimni-ro, Seongdong-Ku, Seoul 04763, Republic of Korea
| | - Shuyuan Liu
- Department of Physics, Research Institute for Natural Science, and Institute for High Pressure at Hanyang University, Hanyang University, 222 Wangsimni-ro, Seongdong-Ku, Seoul 04763, Republic of Korea
| | - Hyunsoo Jeon
- Department of Physics, Research Institute for Natural Science, and Institute for High Pressure at Hanyang University, Hanyang University, 222 Wangsimni-ro, Seongdong-Ku, Seoul 04763, Republic of Korea
| | - Jun-Hyung Cho
- Department of Physics, Research Institute for Natural Science, and Institute for High Pressure at Hanyang University, Hanyang University, 222 Wangsimni-ro, Seongdong-Ku, Seoul 04763, Republic of Korea
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207
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Classifying Charge Carrier Interaction in Highly Compressed Elements and Silane. MATERIALS 2021; 14:ma14154322. [PMID: 34361516 PMCID: PMC8347786 DOI: 10.3390/ma14154322] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 07/24/2021] [Accepted: 07/30/2021] [Indexed: 11/17/2022]
Abstract
Since the pivotal experimental discovery of near-room-temperature superconductivity (NRTS) in highly compressed sulphur hydride by Drozdov et al. (Nature 2015, 525, 73-76), more than a dozen binary and ternary hydrogen-rich phases exhibiting superconducting transitions above 100 K have been discovered to date. There is a widely accepted theoretical point of view that the primary mechanism governing the emergence of superconductivity in hydrogen-rich phases is the electron-phonon pairing. However, the recent analysis of experimental temperature-dependent resistance, R(T), in H3S, LaHx, PrH9 and BaH12 (Talantsev, Supercond. Sci. Technol. 2021, 34, accepted) showed that these compounds exhibit the dominance of non-electron-phonon charge carrier interactions and, thus, it is unlikely that the electron-phonon pairing is the primary mechanism for the emergence of superconductivity in these materials. Here, we use the same approach to reveal the charge carrier interaction in highly compressed lithium, black phosphorous, sulfur, and silane. We found that all these superconductors exhibit the dominance of non-electron-phonon charge carrier interaction. This explains the failure to demonstrate the high-Tc values that are predicted for these materials by first-principles calculations which utilize the electron-phonon pairing as the mechanism for the emergence of their superconductivity. Our result implies that alternative pairing mechanisms (primarily the electron-electron retraction) should be tested within the first-principles calculations approach as possible mechanisms for the emergence of superconductivity in highly compressed lithium, black phosphorous, sulfur, and silane.
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208
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Johnson AS, Conesa JV, Vidas L, Perez-Salinas D, Günther CM, Pfau B, Hallman KA, Haglund RF, Eisebitt S, Wall S. Quantitative hyperspectral coherent diffractive imaging spectroscopy of a solid-state phase transition in vanadium dioxide. SCIENCE ADVANCES 2021; 7:eabf1386. [PMID: 34380611 PMCID: PMC8357230 DOI: 10.1126/sciadv.abf1386] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 06/22/2021] [Indexed: 06/13/2023]
Abstract
Solid-state systems can host a variety of thermodynamic phases that can be controlled with magnetic fields, strain, or laser excitation. Many phases that are believed to exhibit exotic properties only exist on the nanoscale, coexisting with other phases that make them challenging to study, as measurements require both nanometer spatial resolution and spectroscopic information, which are not easily accessible with traditional x-ray spectromicroscopy techniques. Here, we use coherent diffractive imaging spectroscopy (CDIS) to acquire quantitative hyperspectral images of the prototypical quantum material vanadium oxide across the vanadium L 2,3 and oxygen K x-ray absorption edges with nanometer-scale resolution. We extract the full complex refractive indices of the monoclinic insulating and rutile conducting phases of VO2 from a single sample and find no evidence for correlation-driven phase transitions. CDIS will enable quantitative full-field x-ray spectromicroscopy for studying phase separation in time-resolved experiments and other extreme sample environments where other methods cannot operate.
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Affiliation(s)
- Allan S Johnson
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Barcelona, Spain.
| | - Jordi Valls Conesa
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Barcelona, Spain
| | - Luciana Vidas
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Barcelona, Spain
| | - Daniel Perez-Salinas
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Barcelona, Spain
| | - Christian M Günther
- Institut für Optik und Atomare Physik, Technische Universität Berlin, 10623 Berlin, Germany
| | | | - Kent A Hallman
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235-1807, USA
| | - Richard F Haglund
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235-1807, USA
| | - Stefan Eisebitt
- Institut für Optik und Atomare Physik, Technische Universität Berlin, 10623 Berlin, Germany
- Max-Born-Institut, 12489 Berlin, Germany
| | - Simon Wall
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Barcelona, Spain.
- Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark
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209
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Monacelli L, Bianco R, Cherubini M, Calandra M, Errea I, Mauri F. The stochastic self-consistent harmonic approximation: calculating vibrational properties of materials with full quantum and anharmonic effects. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:363001. [PMID: 34049302 DOI: 10.1088/1361-648x/ac066b] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 05/28/2021] [Indexed: 06/12/2023]
Abstract
The efficient and accurate calculation of how ionic quantum and thermal fluctuations impact the free energy of a crystal, its atomic structure, and phonon spectrum is one of the main challenges of solid state physics, especially when strong anharmonicy invalidates any perturbative approach. To tackle this problem, we present the implementation on a modular Python code of the stochastic self-consistent harmonic approximation (SSCHA) method. This technique rigorously describes the full thermodynamics of crystals accounting for nuclear quantum and thermal anharmonic fluctuations. The approach requires the evaluation of the Born-Oppenheimer energy, as well as its derivatives with respect to ionic positions (forces) and cell parameters (stress tensor) in supercells, which can be provided, for instance, by first principles density-functional-theory codes. The method performs crystal geometry relaxation on the quantum free energy landscape, optimizing the free energy with respect to all degrees of freedom of the crystal structure. It can be used to determine the phase diagram of any crystal at finite temperature. It enables the calculation of phase boundaries for both first-order and second-order phase transitions from the Hessian of the free energy. Finally, the code can also compute the anharmonic phonon spectra, including the phonon linewidths, as well as phonon spectral functions. We review the theoretical framework of the SSCHA and its dynamical extension, making particular emphasis on the physical inter pretation of the variables present in the theory that can enlighten the comparison with any other anharmonic theory. A modular and flexible Python environment is used for the implementation, which allows for a clean interaction with other packages. We briefly present a toy-model calculation to illustrate the potential of the code. Several applications of the method in superconducting hydrides, charge-density-wave materials, and thermoelectric compounds are also reviewed.
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Affiliation(s)
- Lorenzo Monacelli
- Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 5, 00185 Roma, Italy
| | - Raffaello Bianco
- Centro de Física de Materiales (CSIC-UPV/EHU), Manuel de Lardizabal pasealekua 5, 20018 Donostia/San Sebastián, Spain
| | - Marco Cherubini
- Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 5, 00185 Roma, Italy
- Center for Life NanoScience, Istituto Italiano di Tecnologia, Viale ReginaElena 291, 00161 Rome, Italy
| | - Matteo Calandra
- Sorbonne Université, CNRS, Institut des Nanosciences de Paris, UMR7588, F-75252 Paris, France
- Dipartimento di Fisica, Universitá di Trento, Via Sommarive 14, 38123 Povo, Italy
| | - Ion Errea
- Centro de Física de Materiales (CSIC-UPV/EHU), Manuel de Lardizabal pasealekua 5, 20018 Donostia/San Sebastián, Spain
- Fisika Aplikatua Saila, Gipuzkoako Ingeniaritza Eskola, University of the Basque Country (UPV/EHU), Europa Plaza 1, 20018 Donostia/San Sebastián, Spain
- Donostia International Physics Center (DIPC), Manuel Lardizabal pasealekua 4, 20018 Donostia/San Sebastián, Spain
| | - Francesco Mauri
- Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 5, 00185 Roma, Italy
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210
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Pressure-induced high-temperature superconductivity retained without pressure in FeSe single crystals. Proc Natl Acad Sci U S A 2021; 118:2108938118. [PMID: 34234019 DOI: 10.1073/pnas.2108938118] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
To raise the superconducting-transition temperature (Tc) has been the driving force for the long-sustained effort in superconductivity research. Recent progress in hydrides with Tcs up to 287 K under pressure of 267 GPa has heralded a new era of room temperature superconductivity (RTS) with immense technological promise. Indeed, RTS will lift the temperature barrier for the ubiquitous application of superconductivity. Unfortunately, formidable pressure is required to attain such high Tcs. The most effective relief to this impasse is to remove the pressure needed while retaining the pressure-induced Tc without pressure. Here, we show such a possibility in the pure and doped high-temperature superconductor (HTS) FeSe by retaining, at ambient pressure via pressure quenching (PQ), its Tc up to 37 K (quadrupling that of a pristine FeSe at ambient) and other pressure-induced phases. We have also observed that some phases remain stable without pressure at up to 300 K and for at least 7 d. The observations are in qualitative agreement with our ab initio simulations using the solid-state nudged elastic band (SSNEB) method. We strongly believe that the PQ technique developed here can be adapted to the RTS hydrides and other materials of value with minimal effort.
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211
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Wang Y, Wang K, Ma Y, Zhou M, Wang H, Liu G. Pressure-induced structural transitions between successional superconducting phases in GeTe. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:355403. [PMID: 34139674 DOI: 10.1088/1361-648x/ac0c3a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Accepted: 06/17/2021] [Indexed: 06/12/2023]
Abstract
Being a best-known prototype of phase-change materials, GeTe was reported to possess many high-pressure phases, whose structural evolution and superconductivity remain under debate for decades. Herein, we systematically investigated the pressure dependence of electrical transport and the structural evolution of the GeTe viain situangle-dispersive synchrotron x-ray diffraction and resistance measurements up to 55 GPa. At room temperature, the structural phase transitions from the initial rhombohedral phase to theFm3̄mphase, and then to an orthorhombicPnmaphase, were observed at pressures of about 4 and 13.4 GPa, respectively. Furthermore, the metallization occurred at around 11 GPa, where the superconductivity could also be observed. With increasing pressure, the superconducting transition temperature increases monotonically from 5.7 to 6.4 K and then is independent of pressure above 23 GPa in the purePnmaphase. These results provide insights into the pressure-dependent evolution of the structure and superconductivity in GeTe and have implications for the understanding of other IV-VI semiconductors at high pressure.
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Affiliation(s)
- Yingying Wang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Kui Wang
- International Center of Computational Method & Software, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Yanmei Ma
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Mi Zhou
- International Center of Computational Method & Software, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Hongbo Wang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
- International Center of Computational Method & Software, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Guangtao Liu
- International Center of Computational Method & Software, College of Physics, Jilin University, Changchun 130012, People's Republic of China
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212
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He X, Walter M, Jiang DE. Understanding Superatomic Ag Nanohydrides. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2004808. [PMID: 33448154 DOI: 10.1002/smll.202004808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 10/24/2020] [Indexed: 06/12/2023]
Abstract
Bulk Ag hydrides are extremely challenging to make even at very high pressures, but they may become stable as the particle size shrinks to the nanometer regime. Here, the formation and electronic structure of Ag nanohydrides are investigated from a superatomic perspective by density functional theory. It is found that as the coverage increases, adsorption energy of hydrogen atoms on Ag38 cluster to form Ag38 H2 n nanohydride (n is from 1 to 15) can be energetically favorable with respect to bare Ag38 and H2 . Furthermore, the adsorbed hydrogen atoms contribute their 1s electrons to the superatom electron count and behave as a metal instead of a ligand. The electronic structure of the silver nanohydrides follows the superatomic complex model, leading to magic or relatively more stable compositions such as Ag38 H2 , Ag38 H20 , and Ag38 H30 , which correspond to 40-electron, 58-electron, and 68-electron shell closings, respectively. Angular momentum analyses of the superatomic orbitals suggest a convoluted interaction of geometry, symmetry, and orbital splitting.
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Affiliation(s)
- Xiang He
- Department of Chemistry, University of California, Riverside, CA, 92521, USA
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, Jiangsu, 210008, China
| | - Michael Walter
- FIT Freiburg Centre for Interactive Materials and Bioinspired Technologies, University of Freiburg, Georges-Köhler-Allee 105, Freiburg, 79110, Germany
| | - De-En Jiang
- Department of Chemistry, University of California, Riverside, CA, 92521, USA
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213
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Cahlík A, Hellerstedt J, Mendieta-Moreno JI, Švec M, Santhini VM, Pascal S, Soler-Polo D, Erlingsson SI, Výborný K, Mutombo P, Marsalek O, Siri O, Jelínek P. Significance Of Nuclear Quantum Effects In Hydrogen Bonded Molecular Chains. ACS NANO 2021; 15:10357-10365. [PMID: 34033457 DOI: 10.1021/acsnano.1c02572] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In hydrogen-bonded systems, nuclear quantum effects such as zero-point motion and tunneling can significantly affect their material properties through underlying physical and chemical processes. Presently, direct observation of the influence of nuclear quantum effects on the strength of hydrogen bonds with resulting structural and electronic implications remains elusive, leaving opportunities for deeper understanding to harness their fascinating properties. We studied hydrogen-bonded one-dimensional quinonediimine molecular networks which may adopt two isomeric electronic configurations via proton transfer. Herein, we demonstrate that concerted proton transfer promotes a delocalization of π-electrons along the molecular chain, which enhances the cohesive energy between molecular units, increasing the mechanical stability of the chain and giving rise to distinctive electronic in-gap states localized at the ends. These findings demonstrate the identification of a class of isomeric hydrogen-bonded molecular systems where nuclear quantum effects play a dominant role in establishing their chemical and physical properties. This identification is a step toward the control of mechanical and electronic properties of low-dimensional molecular materials via concerted proton tunneling.
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Affiliation(s)
- Aleš Cahlík
- Institute of Physics of the Czech Academy of Sciences, v.v.i., Cukrovarnicka 10, CZ-16200 Prague 6, Czech Republic
- Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 78/7, CZ-11519 Prague 1, Czech Republic
- Regional Centre of Advanced Technologies and Materials, Palacký University, Šlechtitelů 27, CZ-78371 Olomouc, Czech Republic
| | - Jack Hellerstedt
- Institute of Physics of the Czech Academy of Sciences, v.v.i., Cukrovarnicka 10, CZ-16200 Prague 6, Czech Republic
| | - Jesús I Mendieta-Moreno
- Institute of Physics of the Czech Academy of Sciences, v.v.i., Cukrovarnicka 10, CZ-16200 Prague 6, Czech Republic
| | - Martin Švec
- Institute of Physics of the Czech Academy of Sciences, v.v.i., Cukrovarnicka 10, CZ-16200 Prague 6, Czech Republic
- Regional Centre of Advanced Technologies and Materials, Palacký University, Šlechtitelů 27, CZ-78371 Olomouc, Czech Republic
| | - Vijai M Santhini
- Institute of Physics of the Czech Academy of Sciences, v.v.i., Cukrovarnicka 10, CZ-16200 Prague 6, Czech Republic
- Regional Centre of Advanced Technologies and Materials, Palacký University, Šlechtitelů 27, CZ-78371 Olomouc, Czech Republic
| | - Simon Pascal
- Aix Marseille Univ, CNRS, CINaM, UMR 7325, Campus de Luminy, F-13288 Marseille Cedex 09 France
| | - Diego Soler-Polo
- Universidad Autónoma de Madrid, Campus Cantoblanco, ES-28049, Madrid, Spain
| | - Sigurdur I Erlingsson
- School of Science and Engineering, Reykjavik University, Menntavegi 1, IS-101 Reykjavik, Iceland
| | - Karel Výborný
- Institute of Physics of the Czech Academy of Sciences, v.v.i., Cukrovarnicka 10, CZ-16200 Prague 6, Czech Republic
| | - Pingo Mutombo
- Institute of Physics of the Czech Academy of Sciences, v.v.i., Cukrovarnicka 10, CZ-16200 Prague 6, Czech Republic
- Department of Petrochemistry and Refining, University of Kinshasa, Kinshasa, Democratic Republic of Congo
| | - Ondrej Marsalek
- Charles University, Faculty of Mathematics and Physics, Ke Karlovu 3, CZ-12116 Prague 2, Czech Republic
| | - Olivier Siri
- Aix Marseille Univ, CNRS, CINaM, UMR 7325, Campus de Luminy, F-13288 Marseille Cedex 09 France
| | - Pavel Jelínek
- Institute of Physics of the Czech Academy of Sciences, v.v.i., Cukrovarnicka 10, CZ-16200 Prague 6, Czech Republic
- Regional Centre of Advanced Technologies and Materials, Palacký University, Šlechtitelů 27, CZ-78371 Olomouc, Czech Republic
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214
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Morresi T, Paulatto L, Vuilleumier R, Casula M. Probing anharmonic phonons by quantum correlators: A path integral approach. J Chem Phys 2021; 154:224108. [PMID: 34241203 DOI: 10.1063/5.0050450] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We devise an efficient scheme to determine vibrational properties from Path Integral Molecular Dynamics (PIMD) simulations. The method is based on zero-time Kubo-transformed correlation functions and captures the anharmonicity of the potential due to both temperature and quantum effects. Using analytical derivations and numerical calculations on toy-model potentials, we show that two different estimators built upon PIMD correlation functions fully characterize the phonon spectra and the anharmonicity strength. The first estimator is associated with the force-force quantum correlators and, in the weak anharmonic regime, yields reliable zero-point motion frequencies and thermodynamic properties of the quantum system. The second one is instead connected to displacement-displacement correlators and accurately probes the lowest-energy phonon excitations, regardless of the anharmonicity strength of the system. We also prove that the use of generalized eigenvalue equations, in place of the standard normal mode equations, leads to a significant speed-up in the PIMD phonon calculations, both in terms of faster convergence rate and smaller time step bias. Within this framework, using ab initio PIMD simulations, we compute phonon dispersions of diamond and of the high-pressure I41/amd phase of atomic hydrogen. We find that in the latter case, the anharmonicity is stronger than previously estimated and yields a sizeable red-shift in the vibrational spectrum of atomic hydrogen.
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Affiliation(s)
- T Morresi
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS UMR 7590, MNHN, 4 Place Jussieu, 75252 Paris, France
| | - L Paulatto
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS UMR 7590, MNHN, 4 Place Jussieu, 75252 Paris, France
| | - R Vuilleumier
- PASTEUR, Département de chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - M Casula
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS UMR 7590, MNHN, 4 Place Jussieu, 75252 Paris, France
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215
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NOGUCHI N. Measurements for Diffusion Coefficients of Hydrogen in Solids at High Pressures Using Micro-Raman Spectroscopy. BUNSEKI KAGAKU 2021. [DOI: 10.2116/bunsekikagaku.70.351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Naoki NOGUCHI
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University
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216
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Reinforcing Increase of ΔTc in MgB 2 Smart Meta-Superconductors by Adjusting the Concentration of Inhomogeneous Phases. MATERIALS 2021; 14:ma14113066. [PMID: 34199745 PMCID: PMC8200031 DOI: 10.3390/ma14113066] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 05/26/2021] [Accepted: 06/02/2021] [Indexed: 11/25/2022]
Abstract
Incorporating with inhomogeneous phases with high electroluminescence (EL) intensity to prepare smart meta-superconductors (SMSCs) is an effective method for increasing the superconducting transition temperature (Tc) and has been confirmed in both MgB2 and Bi(Pb)SrCaCuO systems. However, the increase of ΔTc (ΔTc = Tc ‒ Tcpure) has been quite small because of the low optimal concentrations of inhomogeneous phases. In this work, three kinds of MgB2 raw materials, namely, aMgB2, bMgB2, and cMgB2, were prepared with particle sizes decreasing in order. Inhomogeneous phases, Y2O3:Eu3+ and Y2O3:Eu3+/Ag, were also prepared and doped into MgB2 to study the influence of doping concentration on the ΔTc of MgB2 with different particle sizes. Results show that reducing the MgB2 particle size increases the optimal doping concentration of inhomogeneous phases, thereby increasing ΔTc. The optimal doping concentrations for aMgB2, bMgB2, and cMgB2 are 0.5%, 0.8%, and 1.2%, respectively. The corresponding ΔTc values are 0.4, 0.9, and 1.2 K, respectively. This work open a new approach to reinforcing increase of ΔTc in MgB2 SMSCs.
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217
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Lim J, Kim JS, Hire AC, Quan Y, Hennig RG, Hirschfeld PJ, Hamlin JJ, Stewart GR, Olinger B. A15 Nb 3Si: a 'high' Tcsuperconductor synthesized at a pressure of one megabar and metastable at ambient conditions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:285705. [PMID: 33647891 DOI: 10.1088/1361-648x/abeace] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 03/01/2021] [Indexed: 06/12/2023]
Abstract
A15 Nb3Si is, until now, the only 'high' temperature superconductor produced at high pressure (∼110 GPa) that has been successfully brought back to room pressure conditions in a metastable condition. Based on the current great interest in trying to create metastable-at-room-pressure high temperature superconductors produced at high pressure, we have restudied explosively compressed A15 Nb3Si and its production from tetragonal Nb3Si. First, diamond anvil cell pressure measurements up to 88 GPa were performed on explosively compressed A15 Nb3Si material to traceTcas a function of pressure.Tcis suppressed to ∼5.2 K at 88 GPa. Then, using theseTc(P) data for A15 Nb3Si, pressures up to 92 GPa were applied at room temperature (which increased to 120 GPa at 5 K) on tetragonal Nb3Si. Measurements of the resistivity gave no indication of any A15 structure production, i.e. no indications of the superconductivity characteristic of A15 Nb3Si. This is in contrast to the explosive compression (up toP∼ 110 GPa) of tetragonal Nb3Si, which produced 50%-70% A15 material,Tc= 18 K at ambient pressure, in a 1981 Los Alamos National Laboratory experiment. This implies that the accompanying high temperature (1000 °C) caused by explosive compression is necessary to successfully drive the reaction kinetics of the tetragonal → A15 Nb3Si structural transformation. Our theoretical calculations show that A15 Nb3Si has an enthalpy vs the tetragonal structure that is 70 meV atom-1smallerat 100 GPa, while at ambient pressure the tetragonal phase enthalpy is lower than that of the A15 phase by 90 meV atom-1. The fact that 'annealing' the A15 explosively compressed material at room temperature for 39 years has no effect shows that slow kinetics can stabilize high pressure metastable phases at ambient conditions over long times even for large driving forces of 90 meV atom-1.
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Affiliation(s)
- Jinhyuk Lim
- Department of Physics, University of Florida, Gainesville, FL 32611, United States of America
| | - J S Kim
- Department of Physics, University of Florida, Gainesville, FL 32611, United States of America
| | - Ajinkya C Hire
- Department of Physics, University of Florida, Gainesville, FL 32611, United States of America
| | - Yundi Quan
- Department of Physics, University of Florida, Gainesville, FL 32611, United States of America
| | - R G Hennig
- Department of Physics, University of Florida, Gainesville, FL 32611, United States of America
| | - P J Hirschfeld
- Department of Physics, University of Florida, Gainesville, FL 32611, United States of America
| | - J J Hamlin
- Department of Physics, University of Florida, Gainesville, FL 32611, United States of America
| | - G R Stewart
- Department of Physics, University of Florida, Gainesville, FL 32611, United States of America
| | - Bart Olinger
- Los Alamos National Laboratory, Los Alamos, NM 87545, United States of America
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218
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Abd-Shukor R. Coherence length versus transition temperature of hydride-based and room temperature superconductors. RESULTS IN PHYSICS 2021; 25:104219. [DOI: 10.1016/j.rinp.2021.104219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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219
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Talantsev EF. Comparison of highly-compressed C2/ m-SnH 12superhydride with conventional superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:285601. [PMID: 33908372 DOI: 10.1088/1361-648x/abfc18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 04/27/2021] [Indexed: 06/12/2023]
Abstract
Satterthwaite and Toepke (1970Phys. Rev. Lett.25741) predicted high-temperature superconductivity in hydrogen-rich metallic alloys, based on an idea that these compounds should exhibit high Debye frequency of the proton lattice, which boosts the superconducting transition temperature,Tc. The idea has got full confirmation more than four decades later when Drozdovet al(2015Nature52573) experimentally discovered near-room-temperature superconductivity in highly-compressed sulphur superhydride, H3S. To date, more than a dozen of high-temperature hydrogen-rich superconducting phases in Ba-H, Pr-H, P-H, Pt-H, Ce-H, Th-H, S-H, Y-H, La-H, and (La, Y)-H systems have been synthesized and, recently, Honget al(2021arXiv:2101.02846) reported on the discovery ofC2/m-SnH12phase with superconducting transition temperature ofTc∼ 70 K. Here we analyse the magnetoresistance data,R(T,B), ofC2/m-SnH12phase and report that this superhydride exhibits the ground state superconducting gap of Δ(0) = 9.2 ± 0.5 meV, the ratio of 2Δ(0)/kBTc= 3.3 ± 0.2, and 0.010 <Tc/TF< 0.014 (whereTFis the Fermi temperature) and, thus,C2/m-SnH12falls into unconventional superconductors band in the Uemura plot.
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Affiliation(s)
- E F Talantsev
- M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 18, S. Kovalevskoy St., Ekaterinburg, 620108, Russia
- NANOTECH Centre, Ural Federal University, 19 Mira St., Ekaterinburg, 620002, Russia
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220
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Peña-Alvarez M, Binns J, Martinez-Canales M, Monserrat B, Ackland GJ, Dalladay-Simpson P, Howie RT, Pickard CJ, Gregoryanz E. Synthesis of Weaire-Phelan Barium Polyhydride. J Phys Chem Lett 2021; 12:4910-4916. [PMID: 34008402 DOI: 10.1021/acs.jpclett.1c00826] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
By combining pressures up to 50 GPa and temperatures of 1200 K, we synthesize the novel barium hydride, Ba8H46, stable down to 27 GPa. We use Raman spectroscopy, X-ray diffraction, and first-principles calculations to determine that this compound adopts a highly symmetric Pm3¯n structure with an unusual 534:1 hydrogen-to-barium ratio. This singular stoichiometry corresponds to the well-defined type-I clathrate geometry. This clathrate consists of a Weaire-Phelan hydrogen structure with the barium atoms forming a topologically close-packed phase. In particular, the structure is formed by H20 and H24 clathrate cages showing substantially weakened H-H interactions. Density functional theory (DFT) demonstrates that cubic Pm3¯n Ba8H46 requires dynamical effects to stabilize the H20 and H24 clathrate cages.
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Affiliation(s)
- Miriam Peña-Alvarez
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH8 8AQ, U.K
| | - Jack Binns
- Center for High Pressure Science and Technology Advanced Research, Shanghai 100094, P.R. China
| | - Miguel Martinez-Canales
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH8 8AQ, U.K
| | - Bartomeu Monserrat
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, U.K
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, U.K
| | - Graeme J Ackland
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH8 8AQ, U.K
| | - Philip Dalladay-Simpson
- Center for High Pressure Science and Technology Advanced Research, Shanghai 100094, P.R. China
| | - Ross T Howie
- Center for High Pressure Science and Technology Advanced Research, Shanghai 100094, P.R. China
| | - Chris J Pickard
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, U.K
- Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8577, Japan
| | - Eugene Gregoryanz
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH8 8AQ, U.K
- Center for High Pressure Science and Technology Advanced Research, Shanghai 100094, P.R. China
- Key Laboratory of Materials Physics, Institute of Solid State Physics, CAS, Hefei 230031, P.R. China
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221
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Mezouar M, Garbarino G. Exploring phase transitions and the emergence of structural complexity at the ESRF extremely brilliant source. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:244005. [PMID: 33827062 DOI: 10.1088/1361-648x/abf595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 04/07/2021] [Indexed: 06/12/2023]
Abstract
The underlying mechanisms of phase transitions and the emergence of complexity are long-standing fundamental subjects for which a complete and unified description is still missing. This is due to the intrinsic nature of condensed matter, which contains a very large number of interacting particles. The partial or complete resolution of these open questions will require a considerable development of the experimental and theoretical means. In this context, the newlydevelopedextremely brilliant x-ray source at the European Synchrotron Radiation Facility with its unprecedented performances will provide the scientific community with a unique tool to tackle such challenging objectives. In this review article, we will discuss, through some selected examples, the potential impact this new instrument could have in the short and long term in this field of research.
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Affiliation(s)
- M Mezouar
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, CS 40220, Grenoble 38043, France
| | - G Garbarino
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, CS 40220, Grenoble 38043, France
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222
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Talantsev EF. Quantifying the Charge Carrier Interaction in Metallic Twisted Bilayer Graphene Superlattices. NANOMATERIALS 2021; 11:nano11051306. [PMID: 34063386 PMCID: PMC8156452 DOI: 10.3390/nano11051306] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/10/2021] [Accepted: 05/12/2021] [Indexed: 11/16/2022]
Abstract
The mechanism of charge carrier interaction in twisted bilayer graphene (TBG) remains an unresolved problem, where some researchers proposed the dominance of the electron-phonon interaction, while the others showed evidence for electron-electron or electron-magnon interactions. Here we propose to resolve this problem by generalizing the Bloch-Grüneisen equation and using it for the analysis of the temperature dependent resistivity in TBG. It is a well-established theoretical result that the Bloch-Grüneisen equation power-law exponent, p, exhibits exact integer values for certain mechanisms. For instance, p = 5 implies the electron-phonon interaction, p = 3 is associated with the electron-magnon interaction and p = 2 applies to the electron-electron interaction. Here we interpret the linear temperature-dependent resistance, widely observed in TBG, as p→1, which implies the quasielastic charge interaction with acoustic phonons. Thus, we fitted TBG resistance curves to the Bloch-Grüneisen equation, where we propose that p is a free-fitting parameter. We found that TBGs have a smoothly varied p-value (ranging from 1.4 to 4.4) depending on the Moiré superlattice constant, λ, or the charge carrier concentration, n. This implies that different mechanisms of the charge carrier interaction in TBG superlattices smoothly transition from one mechanism to another depending on, at least, λ and n. The proposed generalized Bloch-Grüneisen equation is applicable to a wide range of disciplines, including superconductivity and geology.
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Affiliation(s)
- Evgueni F. Talantsev
- M. N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 18, S. Kovalevskoy St., 620108 Ekaterinburg, Russia; ; Tel.: +7-912-676-0374
- Nanotech Centre, Ural Federal University, 19 Mira St., 620002 Ekaterinburg, Russia
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223
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Li F, Zhang X, Fu Y, Wang Y, Bergara A, Yang G. Ba with Unusual Oxidation States in Ba Chalcogenides under Pressure. J Phys Chem Lett 2021; 12:4203-4210. [PMID: 33900760 DOI: 10.1021/acs.jpclett.1c00994] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The preparation of compounds with novel atomic oxidation states and emergent properties is of fundamental interest in chemistry. As s-block elements, alkali-earth metals invariably show a +2 formal oxidation state at normal conditions, and among them, barium (Ba) presents the strongest chemical reactivity. Herein, we propose that novel valence states of Ba can be achieved in pressure-induced chalcogenides, where it also shows a feature of 5d-elements. First-principles swarm-intelligence structural search calculations identify three novel stoichiometric compounds: BaCh4 (Ch = O, S) containing Ba2+, Ba3Ch2 (Ch = S, Se, Te) with Ba+ and Ba2+, and Ba2Ch (Ch = Se, Te) with Ba+ cations. The pressure-induced drop of the Ba 5d level relative to Ba 6s is responsible for this unusual oxidation state. These compounds display captivating structural characters, such as Ba-centered polyhedra and chain-shaped Ch units. More interestingly still, the interaction between two Ba+ ions ensures their structural stability.
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Affiliation(s)
- Fei Li
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, China
| | - Xiaohua Zhang
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, China
| | - Yang Fu
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Yanchao Wang
- International Center of Computational Method and Software, State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Aitor Bergara
- Departamento de Física, Universidad del País Vasco-Euskal Herriko Unibertsitatea, UPV/EHU, 48080 Bilbao, Spain
- Donostia International Physics Center (DIPC), 20018 Donostia, Spain
- Centro de Física de Materiales CFM, Centro Mixto CSIC-UPV/EHU, 20018 Donostia, Spain
| | - Guochun Yang
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, China
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224
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Gain P, Jana R, Datta A. Formation of Metallic Polyferrocene Chains under Pressure. J Phys Chem A 2021; 125:3362-3368. [PMID: 33852308 DOI: 10.1021/acs.jpca.1c01205] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effect of pressure on the structural reorganization of ferrocene, Fc = (C5H5)2Fe, is studied using density functional theory (DFT) calculations assisted by evolutionary crystal structure prediction algorithms based on USPEX code. Pressure brings the individual molecules in close contact, and above 220 GPa, the 18-electron closed-shell molecular unit undergoes polymerization through the formation of quasi-one-dimensional (1D) chains, [(C5H5)2Fe]∞, termed as polyferrocene (p-Fc). Pressure induced polymerization (PIP) of Fc causes significant deviations from the 5-fold symmetry of the cyclopentadiene (Cp, C5H5 rings) and loss of planarity due to the onset of envelope-like distortions. This triggers distortions within the multidecker sandwich structures and σ(C-C) bond formation between the otherwise weak noncovalently interacting Cp rings in Fc crystals. Pressure gradually reduces the band gap of Fc, and for p-Fc, metallic states are found due to increased electronic coupling between the covalently linked Cp rings. Polyferrocene is significantly more rigid than ferrocene as evident from the 5-fold increase in its bulk modulus. Pressure dependent Raman spectra show a clear onset of polymerization in Fc at P = 220 GPa. Higher mechanical strength coupled with its metallicity makes p-Fc an interesting candidate for high pressure synthesis.
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Affiliation(s)
- Pranab Gain
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur 700032, West Bengal, India
| | - Rajkumar Jana
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur 700032, West Bengal, India
| | - Ayan Datta
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur 700032, West Bengal, India
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Nakayama R, Maesato M, Lim G, Arita M, Kitagawa H. Heavy Hydrogen Doping into ZnO and the H/D Isotope Effect. J Am Chem Soc 2021; 143:6616-6621. [PMID: 33885297 DOI: 10.1021/jacs.1c02039] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydrogen (H) can drastically change the physical properties of solids by the doping of host materials with minimum perturbation to the lattice because of its small size, quantum nature, and a variety of charged states from -1 (hydride, H-) to +1 (proton, H+). While the H-doping amount is limited under equilibrium conditions, H2+ ion irradiation at low temperature is a promising method for introducing a large amount of hydrogen into any material. Although the application of this method offers the potential for exploring unforeseen fascinating properties, the effects of nonequilibrium H doping at very low temperature below 10 K are largely underexplored and are not well understood. In this article, we report heavy H (D) doping into ZnO films by H2+ (D2+) irradiation at 7 K, which resulted in metallic conductivity and an isotope effect on the conductivity at 7 K. The H/D isotope effect is attributable to metastable H (D) trapping sites generated by the effect of irradiation. The isotope effect is decreased at low acceleration voltage. Furthermore, the subsequent thermal excursion induces a large irreversible decrease in resistivity, indicating the migration of H (D) from metastable trapping sites upon heating. This work provides a new strategy to control the physical properties of materials and to investigate the H (D) migration occurring with increasing temperature after excess H doping at very low temperature.
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Affiliation(s)
- Ryo Nakayama
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Mitsuhiko Maesato
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - GyeongCheol Lim
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Makoto Arita
- Department of Materials Science and Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Hiroshi Kitagawa
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
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226
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Relationship between the TC of Smart Meta-Superconductor Bi(Pb)SrCaCuO and Inhomogeneous Phase Content. NANOMATERIALS 2021; 11:nano11051061. [PMID: 33919085 PMCID: PMC8143111 DOI: 10.3390/nano11051061] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/19/2021] [Accepted: 04/20/2021] [Indexed: 12/04/2022]
Abstract
A smart meta-superconductor Bi(Pb)SrCaCuO (B(P)SCCO) may increase the critical transition temperature (TC) of B(P)SCCO by electroluminescence (EL) energy injection of inhomogeneous phases. However, the increase amplitude ΔTC (ΔTC=TC−TC,pure) of TC is relatively small. In this study, a smart meta-superconductor B(P)SCCO with different matrix sizes was designed. Three kinds of raw materials with different particle sizes were used, and different series of Y2O3:Sm3+, Y2O3, Y2O3:Eu3+, and Y2O3:Eu3++Ag-doped samples and pure B(P)SCCO were prepared. Results indicated that the TC of the Y2O3 or Y2O3:Sm3+ non-luminescent dopant doping sample is lower than that of pure B(P)SCCO. However, the TC of the Y2O3:Eu3++Ag or Y2O3:Eu3+ luminescent inhomogeneous phase doping sample is higher than that of pure B(P)SCCO. With the decrease of the raw material particle size from 30 to 5 μm, the particle size of the B(P)SCCO superconducting matrix in the prepared samples decreases, and the doping content of the Y2O3:Eu3++Ag or Y2O3:Eu3+ increases from 0.2% to 0.4%. Meanwhile, the increase of the inhomogeneous phase content enhances the ΔTC. When the particle size of raw material is 5 μm, the doping concentration of the luminescent inhomogeneous phase can be increased to 0.4%. At this time, the zero-resistance temperature and onset transition temperature of the Y2O3:Eu3++Ag doped sample are 4 and 6.3 K higher than those of pure B(P)SCCO, respectively.
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227
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Lucrezi R, Heil C. Superconductivity and strong anharmonicity in novel Nb-S phases. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:174001. [PMID: 33429377 DOI: 10.1088/1361-648x/abda7a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 01/11/2021] [Indexed: 06/12/2023]
Abstract
In this work we explore the phase diagram of the binary Nb-S system from ambient pressures up to 250 GPa usingab initioevolutionary crystal structure prediction. We find several new stable compositions and phases, especially in the high-pressure regime, and investigate their electronic, vibrational, and superconducting properties. Our calculations show that all materials, besides the low-pressure phases of pure sulfur, are metals with low electron-phonon (ep) coupling strengths and critical superconducting temperatures below 15 K. Furthermore, we investigate the effects of phonon anharmonicity on lattice dynamics, ep interactions, and superconductivity for the novel high-pressure phase of Nb2S, demonstrating that the inclusion of anharmonicity stabilizes the lattice and enhances the ep interaction.
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Affiliation(s)
- Roman Lucrezi
- Institute of Theoretical and Computational Physics, Graz University of Technology, NAWI Graz, 8010 Graz, Austria
| | - Christoph Heil
- Institute of Theoretical and Computational Physics, Graz University of Technology, NAWI Graz, 8010 Graz, Austria
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228
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Ma J, Yang R, Chen H. A large modulation of electron-phonon coupling and an emergent superconducting dome in doped strong ferroelectrics. Nat Commun 2021; 12:2314. [PMID: 33875661 PMCID: PMC8055897 DOI: 10.1038/s41467-021-22541-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 03/17/2021] [Indexed: 11/09/2022] Open
Abstract
We use first-principles methods to study doped strong ferroelectrics (taking BaTiO3 as a prototype). Here, we find a strong coupling between itinerant electrons and soft polar phonons in doped BaTiO3, contrary to Anderson/Blount’s weakly coupled electron mechanism for "ferroelectric-like metals”. As a consequence, across a polar-to-centrosymmetric phase transition in doped BaTiO3, the total electron-phonon coupling is increased to about 0.6 around the critical concentration, which is sufficient to induce phonon-mediated superconductivity of about 2 K. Lowering the crystal symmetry of doped BaTiO3 by imposing epitaxial strain can further increase the superconducting temperature via a sizable coupling between itinerant electrons and acoustic phonons. Our work demonstrates a viable approach to modulating electron-phonon coupling and inducing phonon-mediated superconductivity in doped strong ferroelectrics and potentially in polar metals. Our results also show that the weakly coupled electron mechanism for "ferroelectric-like metals” is not necessarily present in doped strong ferroelectrics. Usually the coupling between polar phonons and itinerant electrons is weak in polar metals. Here, the authors show that in doped ferroelectrics (approximate polar metals), this coupling can be increased across the structural phase transition and as a result, phonon-mediated superconductivity emerges.
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Affiliation(s)
- Jiaji Ma
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai, China
| | - Ruihan Yang
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai, China
| | - Hanghui Chen
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai, China. .,Department of Physics, New York University, New York, NY, USA.
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229
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A Review of the Melting Curves of Transition Metals at High Pressures Using Static Compression Techniques. CRYSTALS 2021. [DOI: 10.3390/cryst11040416] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The accurate determination of melting curves for transition metals is an intense topic within high pressure research, both because of the technical challenges included as well as the controversial data obtained from various experiments. This review presents the main static techniques that are used for melting studies, with a strong focus on the diamond anvil cell; it also explores the state of the art of melting detection methods and analyzes the major reasons for discrepancies in the determination of the melting curves of transition metals. The physics of the melting transition is also discussed.
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230
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Troyan IA, Semenok DV, Kvashnin AG, Sadakov AV, Sobolevskiy OA, Pudalov VM, Ivanova AG, Prakapenka VB, Greenberg E, Gavriliuk AG, Lyubutin IS, Struzhkin VV, Bergara A, Errea I, Bianco R, Calandra M, Mauri F, Monacelli L, Akashi R, Oganov AR. Anomalous High-Temperature Superconductivity in YH 6. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2006832. [PMID: 33751670 DOI: 10.1002/adma.202006832] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/25/2020] [Indexed: 06/12/2023]
Abstract
Pressure-stabilized hydrides are a new rapidly growing class of high-temperature superconductors, which is believed to be described within the conventional phonon-mediated mechanism of coupling. Here, the synthesis of one of the best-known high-TC superconductors-yttrium hexahydride I m 3 ¯ m -YH6 is reported, which displays a superconducting transition at ≈224 K at 166 GPa. The extrapolated upper critical magnetic field Bc2 (0) of YH6 is surprisingly high: 116-158 T, which is 2-2.5 times larger than the calculated value. A pronounced shift of TC in yttrium deuteride YD6 with the isotope coefficient 0.4 supports the phonon-assisted superconductivity. Current-voltage measurements show that the critical current IC and its density JC may exceed 1.75 A and 3500 A mm-2 at 4 K, respectively, which is higher than that of the commercial superconductors, such as NbTi and YBCO. The results of superconducting density functional theory (SCDFT) and anharmonic calculations, together with anomalously high critical magnetic field, suggest notable departures of the superconducting properties from the conventional Migdal-Eliashberg and Bardeen-Cooper-Schrieffer theories, and presence of an additional mechanism of superconductivity.
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Affiliation(s)
- Ivan A Troyan
- Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninskii Prospect, Moscow, 119333, Russia
| | - Dmitrii V Semenok
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow, 121025, Russia
| | - Alexander G Kvashnin
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow, 121025, Russia
| | - Andrey V Sadakov
- P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia
| | - Oleg A Sobolevskiy
- P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia
| | - Vladimir M Pudalov
- P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia
- National Research University, Higher School of Economics, Moscow, 101000, Russia
| | - Anna G Ivanova
- Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninskii Prospect, Moscow, 119333, Russia
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL, 60637, USA
| | - Eran Greenberg
- Center for Advanced Radiation Sources, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL, 60637, USA
| | - Alexander G Gavriliuk
- Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninskii Prospect, Moscow, 119333, Russia
- Institute for Nuclear Research, Russian Academy of Sciences, Fizicheskaya str. 27, Troitsk, Moscow, 108840, Russia
| | - Igor S Lyubutin
- Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninskii Prospect, Moscow, 119333, Russia
| | - Viktor V Struzhkin
- Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China
| | - Aitor Bergara
- Centro de Física de Materiales CFM, CSIC-UPV/EHU, Paseo Manuel de Lardizabal 5, Basque Country, Donostia, 20018, Spain
- Departamento de Física de la Materia Condensada, University of the Basque Country (UPV/EHU), Basque Country, Bilbao, 48080, Spain
- Donostia International Physics Center (DIPC), Manuel Lardizabal pasealekua 4, Basque Country, Donostia, 20018, Spain
| | - Ion Errea
- Centro de Física de Materiales CFM, CSIC-UPV/EHU, Paseo Manuel de Lardizabal 5, Basque Country, Donostia, 20018, Spain
- Donostia International Physics Center (DIPC), Manuel Lardizabal pasealekua 4, Basque Country, Donostia, 20018, Spain
- Fisika Aplikatua 1 Saila, University of the Basque Country (UPV/EHU), Europa plaza 1, Donostia, 20018, Spain
| | - Raffaello Bianco
- Centro de Física de Materiales CFM, CSIC-UPV/EHU, Paseo Manuel de Lardizabal 5, Basque Country, Donostia, 20018, Spain
| | - Matteo Calandra
- Departimento di Fisica, Università di Trento, Via Sommarive 14, Povo, 38123, Italy
- Sorbonne Université, CNRS, Institut des Nanosciences de Paris, UMR7588, Paris, F-75252, France
- Graphene Labs, Fondazione Istituto Italiano di Tecnologia, Via Morego, Genova, I-16163, Italy
| | - Francesco Mauri
- Sorbonne Université, CNRS, Institut des Nanosciences de Paris, UMR7588, Paris, F-75252, France
- Graphene Labs, Fondazione Istituto Italiano di Tecnologia, Via Morego, Genova, I-16163, Italy
| | - Lorenzo Monacelli
- Graphene Labs, Fondazione Istituto Italiano di Tecnologia, Via Morego, Genova, I-16163, Italy
- Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 5, Roma, I-00185, Italy
| | - Ryosuke Akashi
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-8654, Japan
| | - Artem R Oganov
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow, 121025, Russia
- Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 5, Roma, I-00185, Italy
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-8654, Japan
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231
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Yoshizumi T, Koshiba K, Kitsunai S, Yoshizawa T, Nakamura O, Sakai M. Nanoparticulate Pt-catalyzed hydrogenation of Yb films: Towards hydrides with higher hydrogen compositions. Chem Phys 2021. [DOI: 10.1016/j.chemphys.2021.111121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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232
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Bi T, Shamp A, Terpstra T, Hemley RJ, Zurek E. The Li-F-H ternary system at high pressures. J Chem Phys 2021; 154:124709. [PMID: 33810644 DOI: 10.1063/5.0041490] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Evolutionary crystal structure prediction searches have been employed to explore the ternary Li-F-H system at 300 GPa. Metastable phases were uncovered within the static lattice approximation, with LiF3H2, LiF2H, Li3F4H, LiF4H4, Li2F3H, and LiF3H lying within 50 meV/atom of the 0 K convex hull. All of these phases contain HnFn+1 - (n = 1, 2) anions and Li+ cations. Other structural motifs such as LiF slabs, H3 + molecules, and Fδ- ions are present in some of the low enthalpy Li-F-H structures. The bonding within the HnFn+1 - molecules, which may be bent or linear, symmetric or asymmetric, is analyzed. The five phases closest to the hull are insulators, while LiF3H is metallic and predicted to have a vanishingly small superconducting critical temperature. Li3F4H is predicted to be stable at zero pressure. This study lays the foundation for future investigations of the role of temperature and anharmonicity on the stability and properties of compounds and alloys in the Li-F-H ternary system.
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Affiliation(s)
- Tiange Bi
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, USA
| | - Andrew Shamp
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, USA
| | - Tyson Terpstra
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, USA
| | - Russell J Hemley
- Departments of Physics and Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - Eva Zurek
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, USA
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233
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Kopnin EM. Layered Cuprates Containing Flat Fragments: High-Pressure Synthesis, Crystal Structures and Superconducting Properties. Molecules 2021; 26:1862. [PMID: 33806143 PMCID: PMC8037682 DOI: 10.3390/molecules26071862] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 03/23/2021] [Accepted: 03/23/2021] [Indexed: 11/16/2022] Open
Abstract
High-pressure synthesis and crystal structures of the homologous series AuBa2(Ca,Ln)n-1CunO2n+3 (n = 1-4; Ln = rare-earth cations) are described. Their crystal structures and superconducting properties are compared with the corresponding members of the Hg-homologous series. Numerous cuprates containing flat structural fragments (CuO4, CO3 and BO3) synthesized mainly at high pressure are compared in terms of structural peculiarities and superconducting properties. Importance and future prospects of high-pressure application for the preparation of new superconducting oxides are discussed.
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Affiliation(s)
- Evgeny M Kopnin
- Pirelli Tyre SpA, Via Piero e Alberto Pirelli, 25, I-20126 Milan, Italy
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234
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Du M, Zhang Z, Song H, Yu H, Cui T, Kresin VZ, Duan D. High-temperature superconductivity in transition metallic hydrides MH 11 (M = Mo, W, Nb, and Ta) under high pressure. Phys Chem Chem Phys 2021; 23:6717-6724. [PMID: 33710184 DOI: 10.1039/d0cp06435a] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The discovery of H3S and LaH10 is an important step towards the development of room temperature superconductors which fuels the enthusiasm for finding promising superconductors among hydrides at high pressure. In the present study, three new and stable stoichiometric MoH5, MoH6 and MoH11 compounds were found in the pressure range of 100-300 GPa. The highly hydrogen-rich phase of Cmmm-MoH11 has a layered structure that contains various forms of hydrogen: H, H2- and H3- units. It is a high-Tc material with an estimated Tc value in the range of 165-182 K at 250 GPa. The same structures are also found in NbH11, TaH11, and WH11, each material showing Tc ranging from 117 to 168 K. By combining the method of using two coupling constants λopt and λac, and two characteristic frequencies (optical and acoustic) with first-principle calculations, we found that the high values of Tc are mainly caused by the presence of high frequency optical modes, but the acoustic modes also play a noticeable role.
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Affiliation(s)
- Mingyang Du
- State Key Laboratory of Superhard Materials, Department of Physics, Jilin University, Changchun 130012, People's Republic of China.
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235
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Wang H, Yao Y, Peng F, Liu H, Hemley RJ. Quantum and Classical Proton Diffusion in Superconducting Clathrate Hydrides. PHYSICAL REVIEW LETTERS 2021; 126:117002. [PMID: 33798365 DOI: 10.1103/physrevlett.126.117002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 11/20/2020] [Accepted: 02/18/2021] [Indexed: 06/12/2023]
Abstract
The discovery of near room temperature superconductivity in clathrate hydrides has ignited the search for both higher temperature superconductors and deeper understanding of the underlying physical phenomena. In a conventional electron-phonon mediated picture for the superconductivity for these materials, the high critical temperatures predicted and observed can be ascribed to the low mass of the protons, but this also poses nontrivial questions associated with how the proton dynamics affect the superconductivity. Using clathrate superhydride Li_{2}MgH_{16} as an example, we show through ab initio path integral simulations that proton diffusion in this system is remarkably high, with a diffusion coefficient, for example, reaching 6×10^{-6} cm^{2}/s at 300 K and 250 GPa. The diffusion is achieved primarily through proton transfer among interstitial voids within the otherwise rigid Li_{2}Mg sublattice at these conditions. The findings indicate the coexistence of proton quantum diffusion together with hydrogen-induced superconductivity, with implications for other very-high-temperature superconducting hydrides.
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Affiliation(s)
- Hui Wang
- Key Laboratory for Photonic and Electronic Bandgap Materials (Ministry of Education), School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China
| | - Yansun Yao
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Feng Peng
- College of Physics and Electronic Information, Luoyang Normal University, Luoyang 471022, People's Republic of China
| | - Hanyu Liu
- International Center for Computational Method and Software and State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics and International Center of Future Science, Jilin University, Changchun 130012, China
| | - Russell J Hemley
- Departments of Physics and Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA
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236
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Local electronic structure rearrangements and strong anharmonicity in YH 3 under pressures up to 180 GPa. Nat Commun 2021; 12:1765. [PMID: 33741970 PMCID: PMC7979761 DOI: 10.1038/s41467-021-21991-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 02/17/2021] [Indexed: 01/31/2023] Open
Abstract
The discovery of superconductivity above 250 K at high pressure in LaH10 and the prediction of overcoming the room temperature threshold for superconductivity in YH10 urge for a better understanding of hydrogen interaction mechanisms with the heavy atom sublattice in metal hydrides under high pressure at the atomic scale. Here we use locally sensitive X-ray absorption fine structure spectroscopy (XAFS) to get insight into the nature of phase transitions and the rearrangements of local electronic and crystal structure in archetypal metal hydride YH3 under pressure up to 180 GPa. The combination of the experimental methods allowed us to implement a multiscale length study of YH3: XAFS (short-range), Raman scattering (medium-range) and XRD (long-range). XANES data evidence a strong effect of hydrogen on the density of 4d yttrium states that increases with pressure and EXAFS data evidence a strong anharmonicity, manifested as yttrium atom vibrations in a double-well potential.
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237
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Snider E, Dasenbrock-Gammon N, McBride R, Wang X, Meyers N, Lawler KV, Zurek E, Salamat A, Dias RP. Synthesis of Yttrium Superhydride Superconductor with a Transition Temperature up to 262 K by Catalytic Hydrogenation at High Pressures. PHYSICAL REVIEW LETTERS 2021; 126:117003. [PMID: 33798352 DOI: 10.1103/physrevlett.126.117003] [Citation(s) in RCA: 60] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 01/19/2021] [Indexed: 05/25/2023]
Abstract
The recent observation of room-temperature superconductivity will undoubtedly lead to a surge in the discovery of new, dense, hydrogen-rich materials. The rare earth metal superhydrides are predicted to have very high-T_{c} superconductivity that is tunable with changes in stoichiometry or doping. Here we report the synthesis of an yttrium superhydride that exhibits superconductivity at a critical temperature of 262 K at 182±8 GPa. A palladium thin film assists the synthesis by protecting the sputtered yttrium from oxidation and promoting subsequent hydrogenation. Phonon-mediated superconductivity is established by the observation of zero resistance, an isotope effect and the reduction of T_{c} under an external magnetic field. The upper critical magnetic field is 103 T at zero temperature.
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Affiliation(s)
- Elliot Snider
- Department of Mechanical Engineering, School of Engineering and Applied Sciences, University of Rochester, Rochester, New York 14627, USA
| | | | - Raymond McBride
- Department of Mechanical Engineering, School of Engineering and Applied Sciences, University of Rochester, Rochester, New York 14627, USA
| | - Xiaoyu Wang
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260, USA
| | - Noah Meyers
- Department of Mechanical Engineering, School of Engineering and Applied Sciences, University of Rochester, Rochester, New York 14627, USA
| | - Keith V Lawler
- Department of Chemistry & Biochemistry, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA
| | - Eva Zurek
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260, USA
| | - Ashkan Salamat
- Department of Physics & Astronomy, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA
| | - Ranga P Dias
- Department of Mechanical Engineering, School of Engineering and Applied Sciences, University of Rochester, Rochester, New York 14627, USA
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA
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238
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Abstract
Superconductors with exotic physical properties are critical to current and future technology. In this review, we highlight several important superconducting families and focus on their crystal structure, chemical bonding, and superconductivity correlations. We connect superconducting materials with chemical bonding interactions based on their structure-property relationships, elucidating our empirically chemical approaches and other methods used in the discovery of new superconductors. Furthermore, we provide some technical strategies to synthesize superconductors and basic but important characterization for chemists needed when reporting new superconductors. In the end, we share our thoughts on how to make new superconductors and where chemists can work on in the superconductivity field. This review is written using chemical terms, with a focus on providing some chemically intuitive thoughts on superconducting materials design.
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Affiliation(s)
- Xin Gui
- Department of Chemistry, Princeton University, Princeton, New Jersey 08540, United States
| | - Bing Lv
- Department of Physics, University of Texas at Dallas, Richardson, Texas 75080, United States.,Department of Materials Science & Engineering, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Weiwei Xie
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey 08854, United States
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239
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Chen J, Cheng H, Zhou X, Yan X, Wang L, Zhao Y, Wang S. Calibration of Manganin pressure gauge for diamond-anvil cells. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:033905. [PMID: 33819985 DOI: 10.1063/5.0040847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 03/01/2021] [Indexed: 06/12/2023]
Abstract
Pressure calibration for most diamond-anvil cell (DAC) experiments is mainly based on the ruby scale, which is key to implementing this powerful tool for high-pressure study. However, the ruby scale can often hardly be used for programmably controlled DAC devices, especially the piezoelectric-driving cells, where a continuous pressure calibration is required. In this work, we present an effective pressure gauge for DACs made of Manganin metal based on the four-probe resistivity measurements. Pressure dependence of its resistivity is well established and shows excellent linear relations in the 0-30 GPa pressure range with a slope of 23.4 (9) GPa for the first-cycle compression, in contrast to that of multiple-cycle compression and decompression having a nearly identical slope of 33.7 (4) GPa likely due to the strain effect. In addition, the such-established Manganin scale can be used for continuously monitoring the cell pressure of piezoelectric-driving DACs, and the reliability of this method is also verified by the fixed-point method with a Bi pressure standard. Realization of continuous pressure calibration for programmably controlled DACs would offer many opportunities for the study of dynamics, kinetics, and critical behaviors of pressure-induced phase transitions.
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Affiliation(s)
- Jian Chen
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Hu Cheng
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Xuefeng Zhou
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Xiaozhi Yan
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Lingfei Wang
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Yusheng Zhao
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Shanmin Wang
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
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240
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Stabilization and electronic topological transition of hydrogen-rich metal Li 5MoH 11 under high pressures from first-principles predictions. Sci Rep 2021; 11:4079. [PMID: 33602984 PMCID: PMC7893069 DOI: 10.1038/s41598-021-83468-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 02/01/2021] [Indexed: 11/08/2022] Open
Abstract
Regarded as doped binary hydrides, ternary hydrides have recently become the subject of investigation since they are deemed to be metallic under pressure and possibly potentially high-temperature superconductors. Herein, the candidate structure of Li5MoH11 is predicted by exploiting the evolutionary searching. Its high-pressure phase adopts a hexagonal structure with P63/mcm space group. We used first-principles calculations including the zero-point energy to investigate the structures up to 200 GPa and found that the P63cm structure transforms into the P63/mcm structure at 48 GPa. Phonon calculations confirm that the P63/mcm structure is dynamically stable. Its stability is mainly attributed to the isostructural second-order phase transition. Our calculations reveal the electronic topological transition displaying an isostructural second-order phase transition at 160 GPa as well as the topology of its Fermi surfaces. We used the projected crystal orbital Hamilton population (pCOHP) to examine the nature of the chemical bonding and demonstrated that the results obtained from the pCOHP calculation are associated with the electronic band structure and electronic localized function.
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241
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Sun D, Naud MF, Nguyen DN, Betts JB, Singleton J, Balakirev FF. Composite pressure cell for pulsed magnets. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:023903. [PMID: 33648055 DOI: 10.1063/5.0025557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 01/07/2021] [Indexed: 06/12/2023]
Abstract
Extreme pressures and high magnetic fields can affect materials in profound and fascinating ways. However, large pressures and fields are often mutually incompatible; the rapidly changing fields provided by pulsed magnets induce eddy currents in the metallic components used in conventional pressure cells, causing serious heating, forces, and vibration. Here, we report a diamond-anvil-cell made mainly out of insulating composites that minimizes inductive heating while retaining sufficient strength to apply pressures of up to 8 GPa. Any residual metallic component is made of low-conductivity metals and patterned to reduce eddy currents. The simple design enables rapid sample or pressure changes, desired by pulsed-magnetic-field-facility users. The pressure cell has been used in pulsed magnetic fields of up to 65 T with no noticeable heating at cryogenic temperatures. Several measurement techniques are possible inside the cell at temperatures as low as 500 mK.
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Affiliation(s)
- Dan Sun
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - Martin F Naud
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - Doan N Nguyen
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - Jonathan B Betts
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - John Singleton
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - Fedor F Balakirev
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
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242
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Yamashita A, Usui H, Hoshi K, Goto Y, Kuroki K, Mizuguchi Y. Possible pairing mechanism switching driven by structural symmetry breaking in BiS 2-based layered superconductors. Sci Rep 2021; 11:230. [PMID: 33469088 PMCID: PMC7815720 DOI: 10.1038/s41598-020-80544-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 12/21/2020] [Indexed: 11/18/2022] Open
Abstract
Investigation of isotope effects on superconducting transition temperature (Tc) is one of the useful methods to examine whether electron–phonon interaction is essential for pairing mechanisms. The layered BiCh2-based (Ch: S, Se) superconductor family is a candidate for unconventional superconductors, because unconventional isotope effects have previously been observed in La(O,F)BiSSe and Bi4O4S3. In this study, we investigated the isotope effects of 32S and 34S in the high-pressure phase of (Sr,La)FBiS2, which has a monoclinic crystal structure and a higher Tc of ~ 10 K under high pressures, and observed conventional-type isotope shifts in Tc. The conventional-type isotope effects in the monoclinic phase of (Sr,La)FBiS2 are different from the unconventional isotope effects observed in La(O,F)BiSSe and Bi4O4S3, which have a tetragonal structure. The obtained results suggest that the pairing mechanisms of BiCh2-based superconductors could be switched by a structural-symmetry change in the superconducting layers induced by pressure effects.
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Affiliation(s)
- Aichi Yamashita
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, 192-0397, Japan
| | - Hidetomo Usui
- Department of Physics and Materials Science, Shimane University, 1060, Nishikawatsucho, Matsue, 690-8504, Japan
| | - Kazuhisa Hoshi
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, 192-0397, Japan
| | - Yosuke Goto
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, 192-0397, Japan
| | - Kazuhiko Kuroki
- Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan
| | - Yoshikazu Mizuguchi
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, 192-0397, Japan.
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243
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Semenok DV, Zhou D, Kvashnin AG, Huang X, Galasso M, Kruglov IA, Ivanova AG, Gavriliuk AG, Chen W, Tkachenko NV, Boldyrev AI, Troyan I, Oganov AR, Cui T. Novel Strongly Correlated Europium Superhydrides. J Phys Chem Lett 2021; 12:32-40. [PMID: 33296213 DOI: 10.1021/acs.jpclett.0c03331] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We conducted a joint experimental-theoretical investigation of the high-pressure chemistry of europium polyhydrides at pressures of 86-130 GPa. We discovered several novel magnetic Eu superhydrides stabilized by anharmonic effects: cubic EuH9, hexagonal EuH9, and an unexpected cubic (Pm3n) clathrate phase, Eu8H46. Monte Carlo simulations indicate that cubic EuH9 has antiferromagnetic ordering with TN of up to 24 K, whereas hexagonal EuH9 and Pm3n-Eu8H46 possess ferromagnetic ordering with TC = 137 and 336 K, respectively. The electron-phonon interaction is weak in all studied europium hydrides, and their magnetic ordering excludes s-wave superconductivity, except, perhaps, for distorted pseudohexagonal EuH9. The equations of state predicted within the DFT+U approach (U - J were found within linear response theory) are in close agreement with the experimental data. This work shows the great influence of the atomic radius on symmetry-breaking distortions of the crystal structures of superhydrides and on their thermodynamic stability.
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Affiliation(s)
- Dmitrii V Semenok
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, Bolshoy Boulevard 30, bld. 1, Moscow 143026, Russia
| | - Di Zhou
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Alexander G Kvashnin
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, Bolshoy Boulevard 30, bld. 1, Moscow 143026, Russia
| | - Xiaoli Huang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Michele Galasso
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, Bolshoy Boulevard 30, bld. 1, Moscow 143026, Russia
| | - Ivan A Kruglov
- Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
- Dukhov Research Institute of Automatics (VNIIA), Moscow 127055, Russia
| | - Anna G Ivanova
- Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninskii pr-t, Moscow 119333, Russia
| | - Alexander G Gavriliuk
- Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninskii pr-t, Moscow 119333, Russia
- IC RAS Institute for Nuclear Research, Russian Academy of Sciences, Moscow 117312, Russia
| | - Wuhao Chen
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Nikolay V Tkachenko
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, Utah 84322-0300, United States
| | - Alexander I Boldyrev
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, Utah 84322-0300, United States
| | - Ivan Troyan
- Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninskii pr-t, Moscow 119333, Russia
| | - Artem R Oganov
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, Bolshoy Boulevard 30, bld. 1, Moscow 143026, Russia
| | - Tian Cui
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
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244
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Altman AB, Tamerius AD, Koocher NZ, Meng Y, Pickard CJ, Walsh JPS, Rondinelli JM, Jacobsen SD, Freedman DE. Computationally Directed Discovery of MoBi 2. J Am Chem Soc 2021; 143:214-222. [PMID: 33372790 DOI: 10.1021/jacs.0c09419] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Incorporating bismuth, the heaviest element stable to radioactive decay, into new materials enables the creation of emergent properties such as permanent magnetism, superconductivity, and nontrivial topology. Understanding the factors that drive Bi reactivity is critical for the realization of these properties. Using pressure as a tunable synthetic vector, we can access unexplored regions of phase space to foster reactivity between elements that do not react under ambient conditions. Furthermore, combining computational and experimental methods for materials discovery at high-pressures provides broader insight into the thermodynamic landscape than can be achieved through experiment alone, informing our understanding of the dominant chemical factors governing structure formation. Herein, we report our combined computational and experimental exploration of the Mo-Bi system, for which no binary intermetallic structures were previously known. Using the ab initio random structure searching (AIRSS) approach, we identified multiple synthetic targets between 0-50 GPa. High-pressure in situ powder X-ray diffraction experiments performed in diamond anvil cells confirmed that Mo-Bi mixtures exhibit rich chemistry upon the application of pressure, including experimental realization of the computationally predicted CuAl2-type MoBi2 structure at 35.8(5) GPa. Electronic structure and phonon dispersion calculations on MoBi2 revealed a correlation between valence electron count and bonding in high-pressure transition metal-Bi structures as well as identified two dynamically stable ambient pressure polymorphs. Our study demonstrates the power of the combined computational-experimental approach in capturing high-pressure reactivity for efficient materials discovery.
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Affiliation(s)
- Alison B Altman
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Alexandra D Tamerius
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Nathan Z Koocher
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Yue Meng
- HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Chris J Pickard
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB3 0FS, United Kingdom.,Advanced Institute for Materials Research, Tohoku University, Aoba, Sendai 980-8577, Japan
| | - James P S Walsh
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - James M Rondinelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Steven D Jacobsen
- Department of Earth and Planetary Sciences, Northwestern University, Evanston, Illinois 60208, United States
| | - Danna E Freedman
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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245
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Chen W, Semenok DV, Kvashnin AG, Huang X, Kruglov IA, Galasso M, Song H, Duan D, Goncharov AF, Prakapenka VB, Oganov AR, Cui T. Synthesis of molecular metallic barium superhydride: pseudocubic BaH 12. Nat Commun 2021; 12:273. [PMID: 33431840 PMCID: PMC7801595 DOI: 10.1038/s41467-020-20103-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 11/13/2020] [Indexed: 01/29/2023] Open
Abstract
Following the discovery of high-temperature superconductivity in the La-H system, we studied the formation of new chemical compounds in the barium-hydrogen system at pressures from 75 to 173 GPa. Using in situ generation of hydrogen from NH3BH3, we synthesized previously unknown superhydride BaH12 with a pseudocubic (fcc) Ba sublattice in four independent experiments. Density functional theory calculations indicate close agreement between the theoretical and experimental equations of state. In addition, we identified previously known P6/mmm-BaH2 and possibly BaH10 and BaH6 as impurities in the samples. Ab initio calculations show that newly discovered semimetallic BaH12 contains H2 and H3- molecular units and detached H12 chains which are formed as a result of a Peierls-type distortion of the cubic cage structure. Barium dodecahydride is a unique molecular hydride with metallic conductivity that demonstrates the superconducting transition around 20 K at 140 GPa.
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Affiliation(s)
- Wuhao Chen
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China
| | - Dmitrii V Semenok
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow, 143026, Russia
| | - Alexander G Kvashnin
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow, 143026, Russia
| | - Xiaoli Huang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
| | - Ivan A Kruglov
- Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny, 141700, Russia
- Dukhov Research Institute of Automatics (VNIIA), Moscow, 127055, Russia
| | - Michele Galasso
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow, 143026, Russia
| | - Hao Song
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China
| | - Defang Duan
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China
| | - Alexander F Goncharov
- Earth and Planets Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC, 20015, USA
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL, 60637, USA
| | - Artem R Oganov
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow, 143026, Russia.
| | - Tian Cui
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
- School of Physical Science and Technology, Ningbo University, Ningbo, 315211, China.
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246
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Carter OWL, Xu Y, Sadler PJ. Minerals in biology and medicine. RSC Adv 2021; 11:1939-1951. [PMID: 35424161 PMCID: PMC8693805 DOI: 10.1039/d0ra09992a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 12/21/2020] [Indexed: 01/08/2023] Open
Abstract
Natural minerals ('stone drugs') have been used in traditional Chinese medicines for over 2000 years, but there is potential for modern-day use of inorganic minerals to combat viral infections, antimicrobial resistance, and for other areas in need of new therapies and diagnostic aids. Metal and mineral surfaces on scales from milli-to nanometres, either natural or synthetic, are patterned or can be modified with hydrophilic/hydrophobic and ionic/covalent target-recognition sites. They introduce new strategies for medical applications. Such surfaces have novel properties compared to single metal centres. Moreover, 3D mineral particles (including hybrid organo-minerals) can have reactive cavities, and some minerals have dynamic movement of metal ions, anions, and other molecules within their structures. Minerals have a unique ability to interact with viruses, microbes and macro-biomolecules through multipoint ionic and/or non-covalent contacts, with potential for novel applications in therapy and biotechnology. Investigations of mineral deposits in biology, with their often inherent heterogeneity and tendency to become chemically-modified on isolation, are highly challenging, but new methods for their study, including in intact tissues, hold promise for future advances.
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Affiliation(s)
- Oliver W L Carter
- Department of Chemistry, University of Warwick Gibbet Hill Road Coventry CV4 7AL UK
- MAS CDT, Senate House, University of Warwick Coventry CV4 7AL UK
| | - Yingjian Xu
- GoldenKeys High-Tech Materials Co., Ltd, Building B, Innovation & Entrepreneurship Park Guian New Area Guizhou Province 550025 China
| | - Peter J Sadler
- Department of Chemistry, University of Warwick Gibbet Hill Road Coventry CV4 7AL UK
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247
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Silvera IF, Dias R. Phases of the hydrogen isotopes under pressure: metallic hydrogen. ADVANCES IN PHYSICS: X 2021. [DOI: 10.1080/23746149.2021.1961607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Affiliation(s)
| | - Ranga Dias
- Department of Physics and Astronomy and Mechanical Engineering, University of Rochester, Rochester, USA
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248
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Abstract
Quasi-2D square planar nickelates exhibit key ingredients of high-Tc superconducting cuprates. Whether bulk samples are superconducting remains an open question, single crystals are ideal platforms for addressing such fundamental questions.
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Affiliation(s)
- Junjie Zhang
- Institute of Crystal Materials
- State Key Laboratory of Crystal Materials
- Shandong University
- Jinan
- China
| | - Xutang Tao
- Institute of Crystal Materials
- State Key Laboratory of Crystal Materials
- Shandong University
- Jinan
- China
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249
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Ding K, Chen H, Xu H, Yang B, Ge Z, Lu C, Zheng W. Identification of octahedral coordinated ZrN 12+ cationic clusters by mass spectrometry and structure searches. Dalton Trans 2021; 50:10187-10192. [PMID: 34231606 DOI: 10.1039/d1dt01018b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cationic zirconium-doped nitrogen clusters were produced by laser ablation of a Zr : BN mixture target and were detected by TOF mass spectrometry. It is found that the mass peak of the ZrN12+ cluster is dominant in the spectrum. The ZrN12+ cluster was further dissociated with 266 nm photons. Extensive structure searches of a cationic ZrN12+ cluster indicate that the ground state structure of ZrN12+ consists of a central Zr atom and six N2 pairs with Oh symmetry. The calculated binding energy of the ZrN12+ cluster is about 0.96 eV, which is in accordance with the result of the photodissociation experiment. The neutral ZrN12 cluster has almost the same geometry, but with D3h symmetry. NBO analysis showed that the molecular orbitals of ZrN12+/0 clusters are mainly composed of Zr 4d and N 2p orbitals. These findings provide rich information for understanding the geometries and the electronic properties of zirconium-doped N clusters, which will offer valuable guidance for the exploration of other metal doped nitrogen clusters.
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Affiliation(s)
- Kewei Ding
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an 710065, China and Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
| | - Hujie Chen
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China.
| | - Hongguang Xu
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
| | - Bin Yang
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an 710065, China and Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
| | - Zhongxue Ge
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an 710065, China and Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
| | - Cheng Lu
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China.
| | - Weijun Zheng
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
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250
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Chen Z, Ma Z, Zheng J, Li X, Akiba E, Li HW. Perspectives and challenges of hydrogen storage in solid-state hydrides. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2020.08.024] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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