このエントリーをはてなブックマークに追加
ID 19348
本文ファイル
著者
Arita, Masashi
Higashi, Masayuki
Yoshikawa, Kunta
Ueda, Yuko
Tsubota, Masami
Iga, Fumitoshi
キーワード
yttrium compounds
calcium compounds
band structure
inverse photoemission spectra
metal-insulator transition
electronic density of states
electron correlations
抄録(英)
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.
掲載誌名
Physical Review B - Condensed Matter and Materials Physics
75巻
開始ページ
205124-1
終了ページ
205124-7
出版年月日
2007-03-24
出版者
American Physical Society
ISSN
0163-1829
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2007 The American Physical Society.
関連情報URL
部局名
理学研究科
先端物質科学研究科
放射光科学研究センター