Unique Phase Transition on Spin-2 Triangular Lattice of Ag_2MnO_2

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Author(s)

Abstract

Ag_2MnO_2 is studied as a possible candidate compound for an antiferromagnetic XY spin model on a triangular lattice. In spite of the large Curie-Weiss temperature of -430K found in magnetic susceptibility, Mn^<3+> spins with S=2 do not undergo a conventional long-range order down to 2K probably owing to the geometrical frustration and two dimensionality in the system. Instead, a unique phase transition is found at 80K, where specific heat exhibits a clear sign of a second-order phase transition, while magnetic susceptibility changes smoothly without a distinct anomaly. We think that this transition is related to the chirality degree of freedom associated with a short-range order, which has been expected for the classical XY spin model on a triangular lattice. On further cooling, spin-glass-like behavior is observed below 22K, possibly corresponding to a quasi-long-range order.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 77(7), "74719-1"-"74719-8", 2008-07-15

    The Physical Society of Japan (JPS)

References:  37

Codes

  • NII Article ID (NAID)
    110006821329
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00319015
  • NDL Article ID
    9577166
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS 
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