Anomalous variation of phonon Raman intensities near the metal-to-Mott-insulator transition in titanium oxide systems

Takuro Katsufuji, Y. Tokura

研究成果: Article

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Raman-scattering spectra were investigated for strongly correlated electron systems, La1-xSrxTiO3 and Y1-xCaxTiO3, which undergo a metal-to-Mott-insulator transition under variation of the band filling. The phonon spectra decrease in their intensity as the system approaches the metal-insulator phase boundary, accompanied by a critical enhancement of the value of the effective mass, and almost disappear in the insulating phase. We found that the phonon spectral intensity in the metallic region approximately scales with (n/m*)2, n and m* being the density and effective mass of conduction carriers.

元の言語English
ページ(範囲)2704-2707
ページ数4
ジャーナルPhysical Review B
50
発行部数4
DOI
出版物ステータスPublished - 1994
外部発表Yes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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