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

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

    Research output: Contribution to journalArticle

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    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

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    Optical conductivity
    orbitals
    conductivity
    Phase transitions
    Temperature
    temperature

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Charge-gap formation in the insulating states of AV 10O 15 (A = Ba, Sr). / Hoshino, M.; Kajita, Tomomasa; Kanzaki, T.; Uchida, M.; Tokura, Y.; Katsufuji, Takuro.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 85, No. 8, 085106, 13.02.2012.

    Research output: Contribution to journalArticle

    Hoshino, M. ; Kajita, Tomomasa ; Kanzaki, T. ; Uchida, M. ; Tokura, Y. ; Katsufuji, Takuro. / Charge-gap formation in the insulating states of AV 10O 15 (A = Ba, Sr). In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 85, No. 8.
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    AU - Uchida, M.

    AU - Tokura, Y.

    AU - Katsufuji, Takuro

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