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Nature materials v.17 no.6, 2018년, pp.504 - 508   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

An unusual continuous paramagnetic-limited superconducting phase transition in 2D NbSe 2

Sohn, Egon (Department of Physics, The Pennsylvania State University, University Park, PA, USA ) ; Xi, Xiaoxiang (Department of Physics and School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA ) ; He, Wen-Yu (Department of Physics, The Pennsylvania State University, University Park, PA, USA ) ; Jiang, Shengwei (National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China ) ; Wang, Zefang (Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China ) ; Kang, Kaifei (Department of Physics, The Pennsylvania State University, University Park, PA, USA ) ; Park, Ju-Hyun (Department of Physics and School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA ) ; Berger, Helmuth (Department of Physics, The Pennsylvania State University, University Park, PA, USA ) ; Forró, László (Department of Physics and School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA ) ; Law, Kam Tuen (Department of Physics, The Pennsylvania State University, U ) ; Shan, Jie ; Mak, Kin Fai ;
  • 초록  

    Time reversal and spatial inversion are two key symmetries for conventional Bardeen–Cooper–Schrieffer (BCS) superconductivity 1 . Breaking inversion symmetry can lead to mixed-parity Cooper pairing and unconventional superconducting properties 1–5 . Two-dimensional (2D) NbSe 2 has emerged as a new non-centrosymmetric superconductor with the unique out-of-plane or Ising spin–orbit coupling (SOC) 6–9 . Here we report the observation of an unusual continuous paramagnetic-limited superconductor–normal metal transition in 2D NbSe 2 . Using tunelling spectroscopy under high in-plane magnetic fields, we observe a continuous closing of the superconducting gap at the upper critical field at low temperatures, in stark contrast to the abrupt first-order transition observed in BCS thin-film superconductors 10–12 . The paramagnetic-limited continuous transition arises from a large spin susceptibility of the superconducting phase due to the Ising SOC. The result is further supported by self-consistent mean-field calculations based on the ab initio band structure of 2D NbSe 2 . Our findings establish 2D NbSe 2 as a promising platform to explore novel spin-dependent superconducting phenomena and device concepts 1 , such as equal-spin Andreev reflection 13 and topological superconductivity 14–16 .


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