Optical conductivity of Yb1-xLuxB12 : Energy gap and mid-infrared peak in diluted Kondo semiconductors
Physical Review B - Condensed Matter and Materials Physics 62 巻 20 号
R13 265-R13 269 頁
2000-11-15 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
Optical conductivity of Yb1-xLuxB12 : Energy gap and mid-infrared peak in diluted Kondo semiconductors
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| 作成者 |
Okamura Hidekazu
Matsunami Masaharu
Inaoka Tomoaki
Nanba Takao
Kimura Shinichi
Iga Fumitoshi
Hiura Sayaka
Klijn Jan
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| 収録物名 |
Physical Review B - Condensed Matter and Materials Physics
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| 巻 | 62 |
| 号 | 20 |
| 開始ページ | R13 265 |
| 終了ページ | R13 269 |
| 抄録 |
We have measured the optical conductivity σ(ω) of Yb1-xLuxB12 (0≤x≤1), where the system evolves from a Kondo semiconductor at x=0 to a nonmagnetic metal at x=1. For x=0, σ(ω) exhibits a clear energy gap with an onset at ∼20 meV and a shoulder at 38 meV. As x increases, the gap is rapidly filled in from the bottom, while the shoulder remains at ∼40 meV up to x=1/2. These results suggest that Lu substitution into YbB12 produces an in-gap band, but the characteristic energy for the gap remains unchanged in a wide range of x. Spectral evolutions of a characteristic mid-infrared peak, which results from Yb 4f-derived states near the Fermi level, suggest a strong coupling of Yb 4f electrons with conduction electrons.
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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 | 2000-11-15 |
| 権利情報 |
Copyright (c) 2000 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.62.R13265
[NCID] AA11187113
[DOI] http://dx.doi.org/10.1103/PhysRevB.62.R13265
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