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Kyutacarは九州工業大学で生産された研究成果を オープンアクセスで提供する機関リポジトリシステムです。 Kyutacar is open-access repository of research by members of the Kyushu Institute of Technology.
Uppsala University
Harvard University
Kyushu Institute of Technology
Max Planck Institute for Chemical Physics of Solids
Technische Universität Dresden
Uppsala University
Ural Federal University, Lomonosov Moscow State University, National Research South Ural State University
Uppsala University, Örebro University
Uppsala University, Harvard University
抄録
The coexistence of charge density wave (CDW) and superconductivity in tantalum disulfide (2H−TaS2) at low temperature is boosted by applying hydrostatic pressures to study both vibrational and magnetic transport properties. Around Pc, we observe a superconducting dome with a maximum superconducting transition temperature Tc=9.1 K. First-principles calculations of the electronic structure predict that, under ambient conditions, the undistorted structure is characterized by a phonon instability at finite momentum close to the experimental CDW wave vector. Upon compression, this instability is found to disappear, indicating the suppression of CDW order. The calculations reveal an electronic topological transition (ETT), which occurs before the suppression of the phonon instability, suggesting that the ETT alone is not directly causing the structural change in the system. The temperature dependence of the first vortex penetration field has been experimentally obtained by two independent methods. While a d wave and single-gap BCS prediction cannot describe the lower critical field Hc1 data, the temperature dependence of the Hc1 can be well described by a single-gap anisotropic s-wave order parameter.
雑誌名
Physical Review Letters
巻
125
ページ
186401-1 - 186401-6
発行年
2020-10-27
出版者
American Physical Society
ISSN
0031-9007
1079-7114
1092-0145
書誌レコードID
AA00773679
DOI
https://doi.org/10.1103/PhysRevLett.125.186401
権利
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/) license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by Bibsam.
Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory
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