Magnetotransport properties of the orbital-ordered state of Ba1−xSrxV13O18

Kazuma Funahashi, Yu Kakesu, Tomomasa Kajita, Yoshihito Obata, Yumiko Katayama, Kazunori Ueno, Takehito Suzuki, Joseph George Checkelsky, Takuro Katsufuji

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    Abstract

    Magnetotransport properties were investigated for single crystals of Ba1xSrxV13O18 (x ¼ 0; 0:05; 0:2; 1), which exhibit an anomalous orbital-ordered state with electrical conduction at low temperatures. It was found that a positive magnetoresistance, which is 30% at a magnetic field of 14 T, appears only in the low-temperature region (T < 10 K) with an anisotropy negligible in the direction of the magnetic field but a small anisotropy in the direction of the electric current. The behavior of the magnetoresistance hardly changes with x, except for a systematic decrease in its absolute value with increasing x. The fitting of the magnetoresistance by a two-carrier model reveals the existence of carriers with a relatively high mobility (∼103 cm2·V−1·s−1). It was also found by Hall measurement that the majority carriers in the orbital-ordered state are electrons and the number of carriers is much larger than that estimated from the magnetoresistance. On the basis of these experimental results, it was speculated that the ground state of this series of compounds is a semimetallic state with a small number of intrinsic electrons and holes with a high mobility, together with an additional larger number of electrons with a lower mobility.

    Original languageEnglish
    Article number024708
    JournalJournal of the Physical Society of Japan
    Volume88
    Issue number2
    DOIs
    Publication statusPublished - 2019 Jan 1

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    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Funahashi, K., Kakesu, Y., Kajita, T., Obata, Y., Katayama, Y., Ueno, K., Suzuki, T., Checkelsky, J. G., & Katsufuji, T. (2019). Magnetotransport properties of the orbital-ordered state of Ba1−xSrxV13O18 Journal of the Physical Society of Japan, 88(2), [024708]. https://doi.org/10.7566/JPSJ.88.024708