Field-Induced Metallic State in YbB_<12> under High Magnetic Field

概要

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High field magnetization and magnetoresistance of YbB.z are investigated up to550 kOe at low temperatures with special interest in the semiconductive band gapenergy under the field. Very large negative magnetoresistance is found and the systemis perfectly metallic around 500 k0e with anomalous increase in the magnetization.The experimental results are explained by introducing the model that the band gapproduced by the mixing of the f- and conduction electrons is destroyed by applyingthe field and the released f-electron gives an anomalous magnetization. The g./-valueis estimated as 1.9 for the f-level and this means that F. may be most favourable forthe responsible f-electron at the Fermi energy.
社団法人日本物理学会の論文
1988-11-15