Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/103361
Title: Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory
Authors: Kvashnin, Y.
Vangennep, D.
Mito, M.
Medvedev, S. A.
Thiyagarajan, R.
Karis, O.
Vasiliev, A. N.
Eriksson, O.
Abdel-Hafiez, M.
Issue Date: 2020
Publisher: American Physical Society
Citation: Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory / Y. Kvashnin, D. Vangennep, M. Mito, et al. — DOI 10.1103/PhysRevLett.125.186401 // Physical Review Letters. — 2020. — Vol. 125. — Iss. 18. — 186401.
Abstract: 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. © 2020 authors. Published by the American Physical Society.
Keywords: CALCULATIONS
CHARGE DENSITY
CHARGE DENSITY WAVES
ELECTRONIC STRUCTURE
HYDROSTATIC PRESSURE
PHONONS
SHEAR WAVES
SULFUR COMPOUNDS
SUPERCONDUCTING TRANSITION TEMPERATURE
TEMPERATURE DISTRIBUTION
ELECTRONIC TOPOLOGICAL TRANSITION
FIRST-PRINCIPLES CALCULATION
LOWER CRITICAL FIELD
MAGNETICTRANSPORT PROPERTIES
PHONON INSTABILITIES
TEMPERATURE DEPENDENCE
UNDISTORTED STRUCTURE
VORTEX PENETRATION
TANTALUM COMPOUNDS
URI: http://hdl.handle.net/10995/103361
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85094879316
PURE ID: 20131918
b7b180db-261e-4f44-b209-007ce51bc279
ISSN: 319007
DOI: 10.1103/PhysRevLett.125.186401
metadata.dc.description.sponsorship: Y. K. and M. A. H. acknowledge the financial support from the Swedish Research Council (VR) under the Projects No. 2019-03569 and No. 2018-05393. O. E. acknowledges support from the Swedish Research Council, the Knut and Alice Wallenberg Foundation and The Swedish e-science effort, eSSENCE. This work has been supported by Act 211 of the Government of Russian Federation, contracts 02.A03.21.0006 and 02.A03.21.0011. DFG through the Würzburg-Dresden Cluster of Excellence (EXC 2147, Project No. 39085490).
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