Theory for Magnetic Anisotropy of Field-Induced Insulator-to-Metal Transition in Cubic Kondo Insulator YbB_<12>

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Author(s)

Abstract

Magnetization and energy gap of Kondo insulator YbB_<12> are calculated theoretically based on the previously proposed tight-binding model composed of Yb 5dε and 4f Γ_8 orbitals. It is found that magnetization curves are almost isotropic, naturally expected from the cubic symmetry, but that the gap-closing field has an anisotropy: the gap closes faster for the field in (100) direction than in (110) and (111) directions, in accord with the experiments. This is qualitatively understood by considering the maximal eigenvalues of the total angular momentum operators projected on each direction of the magnetic field. But the numerical calculation based on the band model yields better agreement with the experiment.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 76(8), "84715-1"-"84715-4", 2007-08-15

    The Physical Society of Japan (JPS)

References:  24

Codes

  • NII Article ID (NAID)
    110006366864
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00319015
  • NDL Article ID
    8863749
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS 
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