Theory for magnetic anisotropy of field-induced insulator-to-metal transition in cubic kondo insulator YbB_<12>

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概要

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• Copyright(c)2007 The Physical Society of JapanMagnetization and energy gap of Kondo insulator YbB12 are calculated theoretically based on the previously proposed tight-binding model composed of Yb 5d epsilon and 4f Gamma(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 (I 10) 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.

• 社団法人日本物理学会の論文
• 2007-08-15

著者

• Saso Tetsuro

  Division Of Materials Sciences Graduate Course Of Science And Engineering Saitama University

• Imai Yoshiki

  Division Of Materials Sciences Graduate Course Of Science And Engineering Saitama University

• Izumi Toshiyuki

  Division Of Materials Sciences Graduate Course Of Science And Engineering Saitama University

関連論文

• Theory for magnetic anisotropy of field-induced insulator-to-metal transition in cubic kondo insulator YbB_

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