Optical spectra in (La,Y)TiO3: Variation of Mott-Hubbard gap features with change of electron correlation and band filling

Y. Okimoto, Takuro Katsufuji, Y. Okada, T. Arima, Y. Tokura

Research output: Contribution to journalArticle

174 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)9581-9588
Number of pages8
JournalPhysical Review B
Volume51
Issue number15
DOIs
Publication statusPublished - 1995
Externally publishedYes

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Electron correlations
optical spectrum
Hole concentration
Extrapolation
Solid solutions
electrons
Doping (additives)
Bandwidth
Electrons
transition points
extrapolation
solid solutions
insulators
bandwidth

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Optical spectra in (La,Y)TiO3 : Variation of Mott-Hubbard gap features with change of electron correlation and band filling. / Okimoto, Y.; Katsufuji, Takuro; Okada, Y.; Arima, T.; Tokura, Y.

In: Physical Review B, Vol. 51, No. 15, 1995, p. 9581-9588.

Research output: Contribution to journalArticle

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