Energy gap formation in the valence fluctuating compound CeIrSb probed by Sb NMR and NQR

Physical Review B - Condensed Matter and Materials Physics Volume 75 Issue 9 Page 094410-1-094410-5 published_at 2007-03-09
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Title ( eng )
Energy gap formation in the valence fluctuating compound CeIrSb probed by Sb NMR and NQR
Creator
Kawasaki Yu
Izumi Makoto
Kishimoto Yutaka
Ohno Takashi
Tou Hideki
Inaoka Yoshihiko
Shigetoh Keisuke
Source Title
Physical Review B - Condensed Matter and Materials Physics
Volume 75
Issue 9
Start Page 094410-1
End Page 094410-5
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.
Language
eng
Resource Type journal article
Publisher
American Physical Society
Date of Issued 2007-03-09
Rights
Copyright (c) 2007 The American Physical Society.
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 1098-0121
[DOI] 10.1103/PhysRevB.75.094410
[NCID] AA11187113
[DOI] http://dx.doi.org/10.1103/PhysRevB.63.035101