H-T Magnetic Phase Diagram of a Frustrated Triangular Lattice Antiferromagnet CuFeO<sub><b> 2</b></sub>

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  • Mitsuda Setsuo
    Department of Physics, Faculty of Science, Science University of Tokyo, Kagurazaka, Shinjuku–ku, Tokyo 162–8601
  • Mase Motoshi
    Department of Physics, Faculty of Science, Science University of Tokyo, Kagurazaka, Shinjuku–ku, Tokyo 162–8601
  • Uno Takahiro
    Department of Physics, Faculty of Science, Science University of Tokyo, Kagurazaka, Shinjuku–ku, Tokyo 162–8601
  • Kitazawa Hideaki
    National Research Institute for Metals, Tsukuba–shi, Ibaraki 305–0047
  • Katori Hiroko Aruga
    The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351–0198

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  • H-T Magnetic Phase Diagram of a Frustrated Triangular Lattice Antiferromagnet CuFeO2.

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By magnetization and specific heat measurements in an applied magnetic field up to 12 T, we obtained the magnetic field (H) versus temperature (T) phase diagram of a frustrated triangular lattice antiferromagnet (TLA), CuFeO2, where a partially disordered phase typical to Ising TLA exists as a thermally induced state for the 4-sublattice ground state as well as for the first-field-induced 5-sublattice-like state. The experimentally obtained H-T magnetic phase diagram is compared with that from Monte-Carlo simulation of a 2D Ising TLA model with competing exchange interactions up to 3rd neighbors.

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