Optical conductivity of Yb1-xLuxB12 : Energy gap and mid-infrared peak in diluted Kondo semiconductors
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概要
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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.
- American Physical Societyの論文
- 2000-11-15
著者
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高畠 敏郎
Department Of Quantum Matter Adsm Hiroshima University:institute For Advanced Materials Research Hir
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Kleijn J.
Amsterdam大
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Nanba T
Graduate School Of Science And Technology Kobe University
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Hiura S
Hiroshima Univ. Higashi‐hiroshima Jpn
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