SPECTRAL WEIGHT TRANSFER OF THE OPTICAL CONDUCTIVITY IN DOPED MOTT INSULATORS

被引：80
作者：
KATSUFUJI, T
OKIMOTO, Y
TOKURA, Y
机构：
[1] Department of Applied Physics, University of Tokyo
来源：
PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 19期
关键词：
D O I：
10.1103/PhysRevLett.75.3497
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Optical spectra have been systematically investigated for R(1-x)Ca(x)TiO(3) with various rare earth ions R (= La, Pr, Nd, Sm, and Y) as a typical three-dimensional correlated electron system, in which both the electon-correlation strength (U/W) and the band filling (n) can be varied. With a decrease of n from 1, the spectrum of the Mott-gap excitation collapses and the Drude part evolves. We found that the rate of the Drude-part evolution with the nominal hole-doping level delta (= 1 - n) is critically enhanced as U/W approaches the critical value (U/W)(c) for the bandwidth-controlled Mott transition.
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页码：3497 / 3500
页数：4
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