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ID 31972
本文ファイル
著者
Kimura, Shin-ichi
Iizuka, Takuya
Miyazaki, Hidetoshi
Irizawa, Akinori
Muro, Yuji
NDC
物理学
内容記述
We report the anisotropic changes in the electronic structure of a Kondo semiconductor CeOs_2Al_<10> across an anomalous antiferromagnetic ordering temperature (T_0) of 29 K, using optical conductivity spectra. The spectra along the a and c axes indicate that an energy gap due to the hybridization between conduction bands and nearly local 4ƒ states, namely the c-ƒ hybridization gap, emerges from a higher temperature continuously across T_0. Along the b axis, on the other hand, another energy gap with a peak at 20 meV becomes visible at 39 K (>T_0) and fully opens at T_0 because of a charge instability. This result implies that the appearance of the energy gap, as well as the change in the electronic structure along the b axis, induces the antiferromagnetic ordering below T_0.
掲載誌名
Physical review letters
106巻
5号
開始ページ
056404-1
終了ページ
056404-4
出版年月日
2011-02-04
出版者
The American Physical Society
ISSN
0031-9007
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2011 The American Physical Society
関連情報URL
部局名
先端物質科学研究科