Optical conductivity of the Kondo insulator YbB12 : Gap formation and low-energy excitations
Physical Review B - Condensed Matter and Materials Physics 58 巻 12 号
R7496-R7499 頁
1998-09-15 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
Optical conductivity of the Kondo insulator YbB12 : Gap formation and low-energy excitations
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| 作成者 |
Okamura Hidekazu
Kimura Shinichi
Shinozaki H.
Nanba Takao
Iga Fumitoshi
Shimizu Naoki
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| 収録物名 |
Physical Review B - Condensed Matter and Materials Physics
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| 巻 | 58 |
| 号 | 12 |
| 開始ページ | R7496 |
| 終了ページ | R7499 |
| 抄録 |
Optical reflectivity experiments have been conducted on single crystals of the Kondo insulator YbB12 in order to obtain its optical conductivity, σ(ω). Upon cooling below 70 K, a strong suppression of σ(ω) is seen in the far-infrared region, indicating the opening of an energy gap of ∼25 meV. This gap development is coincident with a rapid decrease in the magnetic susceptibility, which shows that the gap opening has significant influence on magnetic properties. A narrow, asymmetric peak is observed at ∼40 meV in σ(ω), which is attributed to optical transitions between the Yb 4f-derived states across the gap. In addition, a broad peak is observed at ∼0.25 eV. This peak is attributed to transitions between Yb 4f-derived states and the p-d band, and is reminiscent of similar peaks previously observed for rare-earth hexaborides.
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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 | 1998-09-15 |
| 権利情報 |
Copyright (c) 1998 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] 0163-1829
[DOI] 10.1103/PhysRevB.58.R7496
[NCID] AA11187113
[DOI] http://dx.doi.org/10.1103/PhysRevB.58.R7496
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