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ID 19291
本文ファイル
著者
Kawasaki, Yu
Izumi, Makoto
Kishimoto, Yutaka
Ohno, Takashi
Tou, Hideki
Inaoka, Yoshihiko
Shigetoh, Keisuke
抄録(英)
Sb NMR and NQR studies have revealed the formation of a pseudogap at the Fermi level in the density of states in a valence fluctuating compound CeIrSb. The nuclear spin-lattice relaxation rate divided by temperature, 1/ T1 T, has a maximum around 300 K and decreases significantly as 1/ T1 T∼ T2, followed by a 1/ T1 T=const relation at low temperature. This temperature dependence of 1/ T1 T is well reproduced by assuming a V-shaped energy gap with a residual density of states at the Fermi level. The size of energy gap for CeIrSb is estimated to be about 350 K, which is by 1 order of magnitude larger than those for the isostructural Kondo semiconductors CeRhSb and CeNiSn. Despite the large difference in the size of energy gap, CeIrSb, CeRhSb, and CeNiSn are indicated to be classified into the same group revealing a V-shaped gap due to c-f hybridization. The temperature dependence of the Knight shift measured in a high magnetic field agrees with the formation of this pseudogap.
掲載誌名
Physical Review B - Condensed Matter and Materials Physics
75巻
9号
開始ページ
094410-1
終了ページ
094410-5
出版年月日
2007-03-09
出版者
American Physical Society
ISSN
1098-0121
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) 2007 The American Physical Society.
関連情報URL
部局名
先端物質科学研究科