Indirect and Direct Energy Gaps in Kondo Semiconductor YbB<sub>12</sub>
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- Okamura Hidekazu
- Graduate School of Science and Technology, Kobe University
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- Michizawa Takahiro
- Graduate School of Science and Technology, Kobe University
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- Nanba Takao
- Graduate School of Science and Technology, Kobe University
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- Kimura Shin-ichi
- UVSOR Facility, Institute for Molecular Science
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- Iga Fumitoshi
- ADSM, Hiroshima University
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- Takabatake Toshiro
- ADSM, Hiroshima University
書誌事項
- タイトル別名
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- Indirect and Direct Energy Gaps in Kondo Semiconductor YbB12
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The optical conductivity [σ(ω)] of the Kondo semiconductor YbB12 has been measured over wide ranges of temperature (T=8–690 K) and photon energy (hω≥1.3 meV). The σ(ω) data reveal the entire crossover of YbB12 from a metallic electronic structure at high T’s to a semiconducting one at low T’s. Associated with the gap development in σ(ω), a clear onset is newly found at hω=15 meV for T≤20 K. The onset energy is identified as the gap magnitude of YbB12 appearing in σ(ω). This gap in σ(ω) is interpreted as the indirect gap, which has been predicted by the renormalized-band model of the Kondo semiconductor. On the other hand, the strong mid-infrared (mIR) peak observed in σ(ω) is interpreted as arising from the direct gap. The absorption coefficient around the onset and the mIR peak indeed show the characteristic energy dependences expected for indirect and direct optical transitions in conventional semiconductors.
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 74 (7), 1954-1957, 2005
一般社団法人 日本物理学会
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詳細情報 詳細情報について
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- CRID
- 1390001204188027136
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- NII論文ID
- 210000105536
- 110001979649
- 130004539331
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- NII書誌ID
- AA00704814
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- BIBCODE
- 2005JPSJ...74.1954O
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 7356971
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可