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ID 19348
file
creator
Arita, Masashi
Higashi, Masayuki
Yoshikawa, Kunta
Ueda, Yuko
Tsubota, Masami
Iga, Fumitoshi
subject
yttrium compounds
calcium compounds
band structure
inverse photoemission spectra
metal-insulator transition
electronic density of states
electron correlations
abstract
We have studied the unoccupied electronic structure of the band insulator CaTiO3, the Mott insulator YTiO3, and Y0.61Ca0.39TiO3 with a metal-insulator transition (MIT) around 150 K by means of Ti 3p-3d resonant inverse photoemission spectroscopy (RIPES). The Ti 3d partial density of states of CaTiO3 deduced from the on- and off-resonance RIPES spectra is in good agreement with results of a band-structure calculation, while that of YTiO3 is explained based on a calculation with the dynamical mean-field theory taking into account an electron correlation. In the case of Y0.61Ca0.39TiO3, we have successfully observed the temperature dependence of RIPES spectra across MIT; the intensity of the incoherent part (a remnant of the upper Hubbard bands) relative to the coherent part (quasiparticle bands) is reduced with decreasing temperature from the insulator to metal phases.
journal title
Physical Review B - Condensed Matter and Materials Physics
volume
Volume 75
start page
205124-1
end page
205124-7
date of issued
2007-03-24
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) 2007 The American Physical Society.
relation url
department
Graduate School of Science
Graduate School of Advanced Sciences of Matter
Hiroshima Synchrotron Radiation Center



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