Optical conductivity of Yb1-xLuxB12 : Energy gap and mid-infrared peak in diluted Kondo semiconductors
Use this link to cite this item : https://ir.lib.hiroshima-u.ac.jp/00018731
ID | 18731 |
file | |
creator |
Okamura, Hidekazu
Matsunami, Masaharu
Inaoka, Tomoaki
Nanba, Takao
Kimura, Shinichi
Iga, Fumitoshi
Hiura, Sayaka
Klijn, Jan
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abstract | 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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journal title |
Physical Review B - Condensed Matter and Materials Physics
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volume | Volume 62
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issue | Issue 20
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start page | R13 265
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end page | R13 269
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date of issued | 2000-11-15
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publisher | American Physical Society
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issn | 0163-1829
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ncid | |
publisher doi | |
language |
eng
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nii type |
Journal Article
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HU type |
Journal Articles
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DCMI type | text
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format | application/pdf
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text version | publisher
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rights | Copyright (c) 2000 American Physical Society.
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relation url | |
department |
Graduate School of Advanced Sciences of Matter
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