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

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説明

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.

収録刊行物

  • Physical Review B

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

    American Physical Society (APS)

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詳細情報 詳細情報について

  • CRID
    1050300291284221824
  • NII書誌ID
    AA11187113
  • ISSN
    24699969
    24699950
  • HANDLE
    2324/7177975
  • 本文言語コード
    en
  • 資料種別
    journal article
  • データソース種別
    • IRDB

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