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ID 19278
file
creator
Sasakawa, Tetsuya
Suemitsu, Toshiaki
Echizen, Yuji
abstract
We have measured the thermal conductivity of isostructural compounds CePtSn, CeNiSn, CeRhSb, and CeRhAs with the orthorhombic ε-TiNiSi-type structure. It is found that the phonon thermal conductivity is reduced in a systematic way with increasing Kondo temperature TK. The scattering of phonons by valence fluctuations should play a dominant role in such a reduction. The gap formation in the electronic density of states enhances the phonon thermal conductivity significantly in CeRhAs with a gap width of 280 K, while it is weak in CeNiSn or CeRhSb with a pseudogap of 20-30 K. A phenomenological model is proposed for the unusual temperature dependence of phonon thermal conductivity by taking account of the strong dependence of the electron-phonon scattering rate on both TK and the energy gap.
journal title
Physical Review B - Condensed Matter and Materials Physics
volume
Volume 66
issue
Issue 22
start page
224304-1
end page
224304-6
date of issued
2002-12-19
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) 2002 The American Physical Society.
relation url
department
Graduate School of Advanced Sciences of Matter