The crossover between the orbital and paramagnetic limits in angle dependence of <i>H</i><sub>c2</sub> of 2D NbSe<sub>2</sub>

ORAL

Abstract

Two-dimensional (2D) NbSe2 is a recently-developed non-centrosymmetric superconductor with the giant upper critical field Hc2 for the parallel magnetic fields (Hc2||) originating from the unique Ising paring. Here we report the angle dependence of Hc2 in 2D NbSe2, which turned out to exhibit the cusp-like behavior around the parallel fields even far below the superconducting critical temperature despite that Hc2|| is dominated purely by the paramagnetic effect[1]. This behavior is well understood within the Ginzburg-Landau framework by considering different origins of Hc2 for the parallel and perpendicular fields. The proposed model is widely applicable to all the superconductors, offering a powerful approach for a comprehensive understanding of the origin of Hc2.
[1] H. Matsuoka et al., Phys. Rev. Research, 2, 012064(R) (2020)

*This work was supported by Grants-in-Aid for Scientific Research (Grant Nos. 19H05602, 19H02593, 19H00653, and 15H05884) and the A3 Foresight Program from the Japan Society for the Promotion of Science.

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Presenters

  • Hideki Matsuoka

    • Univ of Tokyo
    • RIKEN

Authors

  • Hideki Matsuoka

    • Univ of Tokyo
    • RIKEN

  • Masaki Nakano

    • Univ of Tokyo
    • the University of Tokyo

  • Takashi Shitaokoshi

    • the University of Tokyo

  • Takumi Ouchi

    • Institute for Materials Research
    • Tohoku University

  • Yue Wang

    • the University of Tokyo

  • Yuta Kashiwabara

    • the University of Tokyo

  • Satoshi Yoshida

    • the University of Tokyo

  • Kyoko Ishizaka

    • the University of Tokyo
    • University of Tokyo

  • Masashi Kawasaki

    • University of Tokyo
    • RIKEN
    • Univ of Tokyo
    • the University of Tokyo
    • Applied Physics and Quantum-Phase Electronics Center,, University of Tokyo

  • Yoshimitsu Kohama

    • ISSP, University of Tokyo
    • University of Tokyo
    • the University of Tokyo
    • The University of Tokyo

  • Tsutomu Nojima

    • Tohoku University
    • Institute for Materials Research

  • Yoshihiro Iwasa

    • The University of Tokyo
    • Univ of Tokyo
    • Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo
    • the University of Tokyo