Spectral weight transfer of the optical conductivity in doped Mott insulators

T. Katsufuji, Y. Okimoto, Y. Tokura

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Abstract

Optical spectra have been systematically investigated for R1-xCaxTiO3 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 (=1-n) is critically enhanced as U/W approaches the critical value (U/W)c for the bandwidth-controlled Mott transition.

Original languageEnglish
Pages (from-to)3497-3500
Number of pages4
JournalPhysical Review Letters
Volume75
Issue number19
DOIs
Publication statusPublished - 1995 Jan 1

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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