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ID 19350
file
creator
Arita, Masashi
Hiraoka, Koichi
Kojima, Kenichi
Takeda, Yukiharu
Yoshikawa, Kunta
Takata, Yasutaka
Ikenaga, Eiji
Shin, Shik
Kobayashi, Keisuke
Tamasaku, Kenji
Nishino, Yoshinori
Miwa, Daigo
Yabashi, Makina
Ishikawa, Tetsuya
subject
ytterbium alloys
indium alloys
copper alloys
X-ray photoelectron spectra
mixed valence compounds
valence bands
abstract
Yb 3d and valence-band photoemission spectra of the first-order valence-transition compound YbInCu4 have been measured with hard x ray at an excitation energy of 5.95 keV. Abrupt changes are clearly observed in both spectra around the transition temperature TV = 42 K, in comparison with ultraviolet and soft x-ray photoemission (VUV-PES and SX-PES) spectra. From the Yb 3d spectra, the Yb valence has been estimated to be ~2.90 from 220 down to 50 K and ~2.74 at 30–10 K. We propose that Yb 3d hard x-ray photoemission spectroscopy is a very powerful method to estimate the valence of Yb with high accuracy. On the other hand, the Yb2+ 4f-derived peaks in the valence-band spectra exhibit a remarkable enhancement below TV. The shape of the valence-band spectra is different from those of the VUV-PES and SX-PES spectra above TV, reflecting the In 5s and 5p contributions.
journal title
Physical Review Letters
volume
Volume 93
issue
Issue 24
start page
246404-1
end page
246404-4
date of issued
2004-12-10
publisher
American Physical Society
issn
0031-9007
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) 2004 The American Physical Society.
relation url
department
Graduate School of Integrated Arts and Sciences
Graduate School of Science
Hiroshima Synchrotron Radiation Center



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