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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., et al. (2020). Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory. Physical Review Letters, 125(18): 186401, pp. 1-6. doi:10.1103/PhysRevLett.125.186401.

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 Creators:
Kvashnin, Y.1, Author
VanGennep, D.1, Author
Mito, M.1, Author
Medvedev, S. A.2, Author              
Thiyagarajan, R.1, Author
Karis, O.1, Author
Vasiliev, A. N.1, Author
Eriksson, O.1, Author
Abdel-Hafiez, M.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Sergiy Medvediev, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863438              

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Free 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
 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.

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Language(s): eng - English
 Dates: 2020-10-272020-10-27
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevLett.125.186401
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 125 (18) Sequence Number: 186401 Start / End Page: 1 - 6 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1