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ID 18730
file
creator
Okamura, Hidekazu
Kimura, Shinichi
Shinozaki, H.
Nanba, Takao
Iga, Fumitoshi
Shimizu, Naoki
abstract
Optical reflectivity experiments have been conducted on single crystals of the Kondo insulator YbB12 in order to obtain its optical conductivity, σ(ω). Upon cooling below 70 K, a strong suppression of σ(ω) is seen in the far-infrared region, indicating the opening of an energy gap of ∼25 meV. This gap development is coincident with a rapid decrease in the magnetic susceptibility, which shows that the gap opening has significant influence on magnetic properties. A narrow, asymmetric peak is observed at ∼40 meV in σ(ω), which is attributed to optical transitions between the Yb 4f-derived states across the gap. In addition, a broad peak is observed at ∼0.25 eV. This peak is attributed to transitions between Yb 4f-derived states and the p-d band, and is reminiscent of similar peaks previously observed for rare-earth hexaborides.
journal title
Physical Review B - Condensed Matter and Materials Physics
volume
Volume 58
issue
Issue 12
start page
R7496
end page
R7499
date of issued
1998-09-15
publisher
American Physical Society
issn
0163-1829
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 1998 American Physical Society.
relation url
department
Graduate School of Advanced Sciences of Matter