Indirect and Direct Energy Gaps in Kondo Semiconductor YbB_<12>(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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The optical conductivity [σ(ω)] of the Kondo semiconductor YbB_<12> has been measured over wide ranges of temperature (T=8-690K) and photon energy (hω≥1.3meV). The σ(ω) data reveal the entire crossover of YbB_<12> 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=15meV for T≤20K. The onset energy is identified as the gap magnitude of YbB_<12> 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.
- 社団法人日本物理学会の論文
- 2005-07-15
著者
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Kimura S
Department Of Physics Faculty Of Science Kobe University
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Nanba T
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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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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KIMURA Shinichi
UVSOR Facility, Institute for Molecular Science
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IGA Fumitoshi
ADSM, Hiroshima University
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TAKABATAKE Toshiro
ADSM, Hiroshima University
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Katano Susumu
Neutron Scattering Group Advanced Science Research Center Japan Atomic Energy Research Institute
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Kimura Shinichi
Department Of Physics And Graduate School Of Science And Technology Kobe University
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Iga Fumitoshi
Graduate School Of Science And Technology Niigata University
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Iga Fumitoshi
Adsm Hiroshima University
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Kunii S
Graduate School Of Science And Technology Niigata University
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Kunii S
Tohoku Univ. Sendai Jpn
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Sato Ken
Department Of Physics Faculty Of Science Tohoku University
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Takabatake Toshiro
Graduate School Of Quantum Matter Hiroshima University
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Namiki T
Department Of Physics Tokyo Metropolitan University
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Nanba Takao
Department Of Physics Faculty Of Science Kobe University
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Nanba Takao
Graduate School Of Science And Technology Kobe University
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Iga Fumitoshi
Department Of Quantum Matters Adsm Hiroshima University
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Okamura Hidekazu
Graduate School Of Science And Technology Kobe University
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Nanba Takao
Faculty Of Science Kobe University
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Kuroiwa S
Department Of Physics Aoyama Gakuin University
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Michizawa Takahiro
Graduate School Of Science And Technology Kobe University
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Kimura Shinichi
Uvsor Facility Institute For Molecular Science
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Iga F
Graduate School Of Science And Technology Niigata University
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Iga Fumitoshi
Dpartmeot Of Quantum Matter Adsm Hiroshima University
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