Spectral weight transfer of the optical conductivity in doped Mott insulators

T. Katsufuji*, Y. Okimoto, Y. Tokura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)


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
Issue number19
Publication statusPublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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