Spin-singlet trimer state induced by competing orbital order in triangular-lattice BaV10O15

Yasuhiro Shimizu, Keniichiro Matsudaira, Masayuki Itoh, Tomomasa Kajita, Takuro Katsufuji

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    Abstract

    Local spin and orbital textures are investigated by 51V NMR measurements on a triangular-lattice compound BaV10O15 with orbital degrees of freedom and itinerant electrons. The Knight shift shows the spin-singlet V trimer formation in a itinerant phase above the semiconductor-insulator transition temperature TSI=140 K. Below TSI, the observation of the asymmetric electric hyperfine coupling tensor agrees with the orbital order giving direct d-d bonds of the trimer. The remaining paramagnetic spins on a V tetramer exhibit an antiferromagnetic long-range order accompanied by a ferro-type order. The coexistence of the trimer and tetramer with the two opposite magnetism is ascribed to the orbitally induced Peierls instability on a non-half-filling triangular lattice with nonuniform V-V separation.

    Original languageEnglish
    Article number064421
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume84
    Issue number6
    DOIs
    Publication statusPublished - 2011 Aug 23

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    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

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