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ID 33902
file
creator
Utsumi, Yuki
Kurihara, Hidenao
Maso, Hiroyuki
Hiraoka, Koichi
Kojima, Kenichi
Tobimatsu, Komei
Ohkochi, Takuo
Fujimori, Shin-ichi
Takeda, Yukiharu
Saitoh, Yuji
Mimura, Kojiro
Ueda, Shigenori
Yamashita, Yoshiyuki
Yoshikawa, Hideki
Kobayashi, Keisuke
NDC
Physics
abstract
We have studied conduction-band (CB) electronic states of a typical valence-transition compound YbInCu4 by means of temperature-dependent hard x-ray photoemission spectroscopy (HX-PES) of the Cu 2p3/2 and In 3d5/2 core states taken at hν=5.95 keV, soft x-ray absorption spectroscopy (XAS) of the Cu 2p3/2 core absorption region around hν∼935 eV, and soft x-ray photoemission spectroscopy (SX-PES) of the valence band at the Cu 2p3/2 absorption edge of hν=933.0 eV. With decreasing temperature below the valence transition at TV=42 K, we have found that (1) the Cu 2p3/2 and In 3d5/2 peaks in the HX-PES spectra exhibit the energy shift toward the lower binding-energy side by ∼40 and ∼30 meV, respectively, (2) an energy position of the Cu 2p3/2 main absorption peak in the XAS spectrum is shifted toward higher photon-energy side by ∼100 meV, with an appearance of a shoulder structure below the Cu 2p3/2 main absorption peak, and (3) an intensity of the Cu L3VV Auger spectrum is abruptly enhanced. These experimental results suggest that the Fermi level of the CB-derived density of states is shifted toward the lower binding-energy side. We have described the valence transition in YbInCu4 in terms of the charge transfer from the CB to Yb 4f states.
journal title
Physical Review B
volume
Volume 84
issue
Issue 11
start page
115143
date of issued
2011
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) 2011 American Physical Society
relation url
department
Graduate School of Integrated Arts and Sciences
Graduate School of Science
Hiroshima Synchrotron Radiation Center