Theory for magnetic anisotropy of field-induced insulator-to-metal transition in cubic kondo insulator YbB_<12>
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- Izumi Toshiyuki
- Division of Materials Sciences, Graduate Course of Science and Engineering, Saitama University
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- Imai Yoshiki
- Division of Materials Sciences, Graduate Course of Science and Engineering, Saitama University
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- Saso Tetsuro
- Division of Materials Sciences, Graduate Course of Science and Engineering, Saitama University
書誌事項
- タイトル別名
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- Theory for Magnetic Anisotropy of Field-Induced Insulator-to-Metal Transition in Cubic Kondo Insulator YbB<SUB>12</SUB>
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Magnetization and energy gap of Kondo insulator YbB12 are calculated theoretically based on the previously proposed tight-binding model composed of Yb 5dε and 4f Γ8 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.
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 76 (8), 084715-084715, 2007
一般社団法人 日本物理学会
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詳細情報 詳細情報について
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- CRID
- 1390282679173171072
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- NII論文ID
- 130005296991
- 110006366864
- 210000106852
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- NII書誌ID
- AA00704814
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 8863749
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- IRDB
- NDL
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- 使用不可