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ID 33908
file
creator
Yamaoka, Hitoshi
Thunström, Patrik
Tsujii, Naohito
Jarrige, Ignace
Arita, Masashi
Hayashi, Hirokazu
Jiang, Jian
Hiraoka, Nozomu
Ishii, Hirofumi
Tsuei, Ku-Ding
Giovannini, Mauro
Bauer, Ernst
NDC
Physics
abstract
We have examined the electronic structure of the heavy fermion Yb2Pd2Sn in comparison with the superconductor YbPd2Sn by means of high-resolution photoelectron spectroscopy (PES) and resonant x-ray emission spectroscopy (RXES). The PES data are interpreted in light of the density of states calculated within the local density approximation plus the dynamical mean-field theory. Our analysis of the RXES data shows that the valence of Yb in Yb2Pd2Sn is weakly fluctuating, indicating weak but finite c–f hybridization, and decreases slightly with temperature. In contrast, the Yb valence in YbPd2Sn is nearly 3+ and does not show any temperature dependence, suggesting that the Yb 4f electrons are localized and the superconductivity is due to the Pd conduction electrons. The constant initial state spectra at the Yb 4d–4f resonance for Yb2Pd2Sn clearly show resonant behavior for Yb3+ and antiresonance for Yb2+, indicating that the Yb3+ and Yb2+ states are intimately correlated.
journal title
Physical Review B
volume
Volume 86
issue
Issue 8
start page
085137
date of issued
2012
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
(c) 2012 American Physical Society
relation url
department
Hiroshima Synchrotron Radiation Center