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ID 19338
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creator
Saitoh, Tomohiko
Fujimori, Atsushi
Ishida, Shoji
Asano, Setsuro
Matoba, Masanori
Anzai, Shuichiro
abstract
The electronic structures of the itinerant ferromagnets Cr1-δTe (δ=0.05, 0.25, and 0.375) have been studied by photoemission spectroscopy. The valence-band spectra are compared with the density of states given by band-structure calculations. In spite of the itinerant nature of the d electrons, disagreement between the photoemission spectra and the band-structure calculations exists in the magnitude of the d-band exchange splitting and the spectral weight at the Fermi level and 2-4 eV below it: The occupied d band for δ=0.05 is shifted away from the Fermi level; the observed spectral weight at the Fermi level is significantly suppressed compared with the band-structure calculations for δ=0.05 and 0.375, where the nominal d-electron numbers are close to integers 4 and 3, respectively. Configuration-interaction cluster-model calculations have been made for δ=0.05 and 0.375 to explain the spectral weight distribution in the high-binding-energy (2-4 eV) region in terms of electron-correlation effects. The d-d on-site Coulomb energy is estimated to be significant, U∼2 eV, and nearly equal to or smaller than the charge-transfer energy Δ∼2-3 eV.
journal title
Physical Review B - Condensed Matter and Materials Physics
volume
Volume 53
issue
Issue 12
start page
7673
end page
7683
date of issued
1996-03-15
publisher
American Physical Society
issn
0163-1829
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) 1996 The American Physical Society.
relation url
department
Hiroshima Synchrotron Radiation Center