OPTICAL-SPECTRA IN (LA,Y)TIO3 - VARIATION OF MOTT-HUBBARD GAP FEATURES WITH CHANGE OF ELECTRON CORRELATION AND BAND FILLING

被引：209

作者：

OKIMOTO, Y

KATSUFUJI, T

OKADA, Y

ARIMA, T

TOKURA, Y

机构：

[1] Department of Physics, University of Tokyo

来源：

PHYSICAL REVIEW B | 1995年 / 51卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.51.9581

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Optical spectra have been investigated for the prototypical Mott-Hubbard (MH) insulators LaTiO3 and YTiO3, and their solid solutions LaxY1-xTiO3. The MH gap shows a critical variation with x or equivalently with the change of the one-electron bandwidth W. By an extrapolation of the rapidly varying MH gap with the electron correlation strength (U=U/W), we could determine the relative distance of each compound from the hypothetical Mott transition point (Uc). The band-filling dependence of the gap spectra has been also investigated for LaTiO3+δ/2 with the nominal hole concentration δ. The systematic collapse of the MH gap is argued, together with similar results on filling-controlled compounds Y1-xCaxTiO3, in terms of doping-induced spectral weight transfer. © 1995 The American Physical Society.

引用

页码：9581 / 9588

页数：8

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