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Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory.
Kvashnin, Y; VanGennep, D; Mito, M; Medvedev, S A; Thiyagarajan, R; Karis, O; Vasiliev, A N; Eriksson, O; Abdel-Hafiez, M.
Afiliación
  • Kvashnin Y; Uppsala University, Department of Physics and Astronomy, Box 516, SE-751 20 Uppsala, Sweden.
  • VanGennep D; Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
  • Mito M; Graduate School of Engineering, Kyushu Institute of Technology, Fukuoka 804-8550, Japan.
  • Medvedev SA; Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
  • Thiyagarajan R; Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01069 Dresden, Germany.
  • Karis O; Uppsala University, Department of Physics and Astronomy, Box 516, SE-751 20 Uppsala, Sweden.
  • Vasiliev AN; Ural Federal University, Yekaterinburg 620002, Russia.
  • Eriksson O; Lomonosov Moscow State University, Moscow 119991, Russia.
  • Abdel-Hafiez M; National Research South Ural State University, Chelyabinsk 454080, Russia.
Phys Rev Lett ; 125(18): 186401, 2020 Oct 30.
Article en En | MEDLINE | ID: mdl-33196259
The coexistence of charge density wave (CDW) and superconductivity in tantalum disulfide (2H-TaS_{2}) at low temperature is boosted by applying hydrostatic pressures to study both vibrational and magnetic transport properties. Around P_{c}, we observe a superconducting dome with a maximum superconducting transition temperature T_{c}=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 H_{c1} data, the temperature dependence of the H_{c1} can be well described by a single-gap anisotropic s-wave order parameter.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2020 Tipo del documento: Article País de afiliación: Suecia Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2020 Tipo del documento: Article País de afiliación: Suecia Pais de publicación: Estados Unidos