Optical investigations on Y2-xBixRu2O7: Electronic structure evolutions related to the metal-insulator transition

J. S. Lee, S. J. Moon, T. W. Noh, T. Takeda, R. Kanno, Shunsuke Yoshii, M. Sato

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Optical conductivity spectra of cubic pyrochlore Y2-xBixRu2O7 (0.0≤x≤2.0) compounds are investigated. As a metal-insulator transition (MIT) occurs around x=0.8, large spectral changes are observed. With increase of x, the correlation-induced peak between the lower and the upper Hubbard bands seems to be suppressed, and a strong mid-infrared feature is observed. In addition, the p-d charge transfer peak shifts to the lower energies. The spectral changes cannot be explained by electronic structural evolutions in the simple bandwidth-controlled MIT picture, but are consistent with those in the filling-controlled MIT picture. In addition, they are also similar to the spectral changes of Y2-xCaxRu2O7 compounds, which is a typical filling-controlled system. This work suggests that, near the MIT, the Ru bands could be doped with the easily polarizable Bi cations.

Original languageEnglish
Article number035124
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number3
DOIs
Publication statusPublished - 2005 Jul 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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