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ID 31972
file
creator
Kimura, Shin-ichi
Iizuka, Takuya
Miyazaki, Hidetoshi
Irizawa, Akinori
Muro, Yuji
NDC
Physics
description
We report the anisotropic changes in the electronic structure of a Kondo semiconductor CeOs_2Al_<10> across an anomalous antiferromagnetic ordering temperature (T_0) of 29 K, using optical conductivity spectra. The spectra along the a and c axes indicate that an energy gap due to the hybridization between conduction bands and nearly local 4ƒ states, namely the c-ƒ hybridization gap, emerges from a higher temperature continuously across T_0. Along the b axis, on the other hand, another energy gap with a peak at 20 meV becomes visible at 39 K (>T_0) and fully opens at T_0 because of a charge instability. This result implies that the appearance of the energy gap, as well as the change in the electronic structure along the b axis, induces the antiferromagnetic ordering below T_0.
journal title
Physical review letters
volume
Volume 106
issue
Issue 5
start page
056404-1
end page
056404-4
date of issued
2011-02-04
publisher
The American Physical Society
issn
0031-9007
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) 2011 The American Physical Society
relation url
department
Graduate School of Advanced Sciences of Matter