Electronic properties of Ba1-xSrx V13 O18 (x=0,0.2,1) studied using hard x-ray photoelectron spectroscopy

S. Dash, M. Okawa, Tomomasa Kajita, T. Yoshino, R. Shimoyama, K. Takahashi, Y. Takahashi, R. Takayanagi, T. Saitoh, D. Ootsuki, T. Yoshida, E. Ikenaga, N. L. Saini, Takuro Katsufuji, Takashi Mizokawa

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    Abstract

    We have studied the electronic structure of Ba1-xSrxV13O18 (x=0,0.2,1) at different temperatures across the trimerization and charge-order transitions using hard x-ray photoemission spectroscopy (HAXPES). The V 2p HAXPES indicates V2+/V3+ charge order and fluctuation in the high-temperature tetramer phase, low-temperature trimer phase, and intermediate-temperature charge-order phase in the series of x=0,0.2,1. In the valence-band HAXPES, although the spectral weight at the Fermi level tends to be suppressed in all the phases due to strong charge order or fluctuation, it increases in the trimer phase at x=0.2, in agreement with the decrease of resistivity and the increase of itinerant electrons in the trimer phase. Interestingly, in the most conducting x=1 without the charge-order phase, the spectral weight at the Fermi level is strongly suppressed even in the trimer phase, indicating that charge fluctuation in the trimer phase is different between x=0.2 and 1.

    Original languageEnglish
    Article number195116
    JournalPhysical Review B
    Volume95
    Issue number19
    DOIs
    Publication statusPublished - 2017 May 9

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    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

    Dash, S., Okawa, M., Kajita, T., Yoshino, T., Shimoyama, R., Takahashi, K., Takahashi, Y., Takayanagi, R., Saitoh, T., Ootsuki, D., Yoshida, T., Ikenaga, E., Saini, N. L., Katsufuji, T., & Mizokawa, T. (2017). Electronic properties of Ba1-xSrx V13 O18 (x=0,0.2,1) studied using hard x-ray photoelectron spectroscopy. Physical Review B, 95(19), [195116]. https://doi.org/10.1103/PhysRevB.95.195116