Kondo breakdown in the topological Kondo insulator SmB_6 studied by point-contact Andreev reflection spectroscopy

IR (HANDLE) Open Access
  • Shiga, Masanobu
    Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University
  • Teramoto, Tsubasa
    Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University
  • Harada, Takurou
    Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University
  • Takahashi, Takuya
    Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University
  • Iga, Fumitoshi
    Institute of Quantum Beam Science, Graduate School of Science and Engineering, Ibaraki University
  • Kawae, Tatsuya
    Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University

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Description

We studied the topological features in Kondo insulator SmB_6 by point-contact Andreev reflection spectroscopy with a Nb probe tip. Below the superconducting transition of Nb, the spectra exhibited a narrow dip at around zero bias superposed on a broad asymmetric background caused by the Kondo resonance. The contact-size dependence of the spectra revealed that the width of the resonance is suppressed near the surface. The spin polarization in the surface state was ∼0.56, which is smaller than that in Bi-based topological insulators. These indicate that the Kondo breakdown plays a crucial role for the topological features, not only in the bulk state near the surface but also in the surface state on SmB_6.

Journal

  • Physical Review B

    Physical Review B 108 (19), 195130-1-195130-8, 2023-11-15

    American Physical Society (APS)

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Details 詳細情報について

  • CRID
    1050300291284221824
  • NII Book ID
    AA11187113
  • ISSN
    24699969
    24699950
  • HANDLE
    2324/7177975
  • Text Lang
    en
  • Article Type
    journal article
  • Data Source
    • IRDB

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