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Highly Isotropic In-plane Upper Critical Field in the Anisotropic s-Wave Superconductor 2H-NbSe2

  • Syuma YasuzukaEmail author
  • Shinya Uji
  • Shiori Sugiura
  • Taichi Terashima
  • Yoshio Nogami
  • Koichi Ichimura
  • Satoshi Tanda
Original Paper

Abstract

Resistivity measurements for a layered transition metal dichalcogenide 2H-NbSe2 were performed to investigate the in-plane anisotropy of the upper critical field (Hc2) for magnetic fields up to 14.5 T at temperatures down to 2.0 K. For fields rotated within the basal plane, the in-plane anisotropy of a characteristic field H (defined as the field strength at which the resistivity reaches zero) showed twofold symmetry at low temperatures. On the basis of this result, the in-plane anisotropy of Hc2 and the superconducting gap structure in 2H-NbSe2 are discussed.

Keywords

2H-NbSe2 Upper critical field Anisotropic s-wave superconductivity Superconducting gap 

Notes

Acknowledgments

The authors thank T. Konoike for useful discussion and experimental supports.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Syuma Yasuzuka
    • 1
    Email author
  • Shinya Uji
    • 2
  • Shiori Sugiura
    • 2
    • 5
  • Taichi Terashima
    • 2
  • Yoshio Nogami
    • 3
  • Koichi Ichimura
    • 4
  • Satoshi Tanda
    • 4
  1. 1.Research Center for Condensed Matter PhysicsHiroshima Institute of TechnologyHiroshimaJapan
  2. 2.National Institute for Materials ScienceTsukubaJapan
  3. 3.Department of PhysicsOkayama UniversityOkayamaJapan
  4. 4.Department of Applied PhysicsHokkaido UniversityKita-ku SapporoJapan
  5. 5.Institute for Materials ResearchTohoku UniversitySendaiJapan

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