Anomalous metallic state in the vicinity of metal to valence-bond solid insulator transition in LiVS2

N. Katayama, M. Uchida, D. Hashizume, S. Niitaka, J. Matsuno, D. Matsumura, Y. Nishihata, J. Mizuki, N. Takeshita, A. Gauzzi, M. Nohara, H. Takagi

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    46 Citations (Scopus)

    Abstract

    We investigate LiVS2 and LiVSe2 with a triangular lattice as itinerant analogues of LiVO2 known for the formation of a valence-bond solid (VBS) state out of an S=1 frustrated magnet. LiVS2, which is located at the border between a metal and a correlated insulator, shows a first order transition from a paramagnetic metal to a VBS insulator at Tc∼305K upon cooling. The presence of a VBS state in the close vicinity of insulator-metal transition may suggest the importance of itinerancy in the formation of a VBS state. We argue that the high temperature metallic phase of LiVS2 has a pseudogap, likely originating from the VBS fluctuation. LiVSe2 was found to be a paramagnetic metal down to 2 K.

    Original languageEnglish
    Article number146405
    JournalPhysical Review Letters
    Volume103
    Issue number14
    DOIs
    Publication statusPublished - Oct 2 2009

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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