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ID 19291
file
creator
Kawasaki, Yu
Izumi, Makoto
Kishimoto, Yutaka
Ohno, Takashi
Tou, Hideki
Inaoka, Yoshihiko
Shigetoh, Keisuke
abstract
Sb NMR and NQR studies have revealed the formation of a pseudogap at the Fermi level in the density of states in a valence fluctuating compound CeIrSb. The nuclear spin-lattice relaxation rate divided by temperature, 1/ T1 T, has a maximum around 300 K and decreases significantly as 1/ T1 T∼ T2, followed by a 1/ T1 T=const relation at low temperature. This temperature dependence of 1/ T1 T is well reproduced by assuming a V-shaped energy gap with a residual density of states at the Fermi level. The size of energy gap for CeIrSb is estimated to be about 350 K, which is by 1 order of magnitude larger than those for the isostructural Kondo semiconductors CeRhSb and CeNiSn. Despite the large difference in the size of energy gap, CeIrSb, CeRhSb, and CeNiSn are indicated to be classified into the same group revealing a V-shaped gap due to c-f hybridization. The temperature dependence of the Knight shift measured in a high magnetic field agrees with the formation of this pseudogap.
journal title
Physical Review B - Condensed Matter and Materials Physics
volume
Volume 75
issue
Issue 9
start page
094410-1
end page
094410-5
date of issued
2007-03-09
publisher
American Physical Society
issn
1098-0121
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) 2007 The American Physical Society.
relation url
department
Graduate School of Advanced Sciences of Matter