Superconductivity in non-centrosymmetric rhombohedral NbSe2

ORAL

Abstract

Here we report a newly synthesized non-centrosymmetric superconductor, rhombohedral NbSe2. We observe its superconductivity in both bulk and few-layer flakes. Interestingly, the superconducting transition temperature (Tc) scales linearly with the residual resistivity ratio (RRR) for RRR < 5, yet remains independent of sample thickness. The contrasting behavior compared to 2H phase indicates the inversion symmetry breaking in rhombohedral stacking. Besides, signatures of modified spin–orbit coupling (SOC) affecting superconductivity has been detected through electrical transport measurements under a magnetic field. Our results show the rhombohedral phase provides a versatile platform for studying unconventional superconducting phenomena in non-centrosymmetric layered materials.

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Presenters

  • Xiaoyu Shen

    • Shanghai Jiao Tong Univ

Authors

  • Xiaoyu Shen

    • Shanghai Jiao Tong Univ

  • Zhengxian Li

    • Shanghai Jiao Tong Univ

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • Guorui Chen

    • Shanghai Jiao Tong Univ
    • School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China