Energy gap formation in the valence fluctuating compound CeIrSb probed by Sb NMR and NQR
Physical Review B - Condensed Matter and Materials Physics 75 巻 9 号
094410-1-094410-5 頁
2007-03-09 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
Energy gap formation in the valence fluctuating compound CeIrSb probed by Sb NMR and NQR
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| 作成者 |
Kawasaki Yu
Izumi Makoto
Kishimoto Yutaka
Ohno Takashi
Tou Hideki
Inaoka Yoshihiko
Shigetoh Keisuke
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| 収録物名 |
Physical Review B - Condensed Matter and Materials Physics
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| 巻 | 75 |
| 号 | 9 |
| 開始ページ | 094410-1 |
| 終了ページ | 094410-5 |
| 抄録 |
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.
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| 言語 |
英語
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| 資源タイプ | 学術雑誌論文 |
| 出版者 |
American Physical Society
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| 発行日 | 2007-03-09 |
| 権利情報 |
Copyright (c) 2007 The American Physical Society.
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| 出版タイプ | Version of Record（出版社版。早期公開を含む） |
| アクセス権 | オープンアクセス |
| 収録物識別子 |
[ISSN] 1098-0121
[DOI] 10.1103/PhysRevB.75.094410
[NCID] AA11187113
[DOI] http://dx.doi.org/10.1103/PhysRevB.63.035101
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