Charge-gap formation in the insulating states of AV 10O 15 (A = Ba, Sr)

M. Hoshino, T. Kajita, T. Kanzaki, M. Uchida, Y. Tokura, T. Katsufuji

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6 Citations (Scopus)

Abstract

We measured the optical conductivity spectra of SrV 10O 15 with V2.8 +, which exhibits an insulating behavior without any phase transition, and compared the results with those of BaV 10O 15, which shows orbital ordering below T c=123 K. We found that a soft gap opens at the lowest temperature but it collapses with increasing temperature in SrV 10O 15, in contrast to a finite charge gap (∼0.3 eV) in BaV 10O 15 below T c. We also found that the difference of the conductivity spectra between SrV 10O 15 and BaV 10O 15 evolves even above T c of Ba, indicating that the fluctuation of orbital ordering produces a pseudogap in BaV 10O 15.

Original languageEnglish
Article number085106
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number8
DOIs
Publication statusPublished - 2012 Feb 13

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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