Partially Disordered Phase in Frustrated Triangular Lattice Antiferromagnet CuFeO2.

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  • Mitsuda Setsuo
    Department of Physics, Faculty of Science, Science University of Tokyo, Kagurazaka, Shinjuku–ku, Tokyo 162–8601
  • Kasahara Noriaki
    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
  • Mase Motoshi
    Department of Physics, Faculty of Science, Science University of Tokyo, Kagurazaka, Shinjuku–ku, Tokyo 162–8601

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  • Partially Disordered Phase in Frustrated Triangular Lattice Antiferromagnet CuFeO<sub><b>2</b></sub>

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We reinvestigated successive magnetic phase transitions (TN1-- 14.0K, TN2-- 10.5K) in a frustrated triangular lattice antiferromagnet (TLA) CuFeO2 by neutron diffraction measurements using single crystals. The magnetic structure of the intermediate-temperature phase between TN1 and TN2 is found to be a quasi-long range ordered sinusoidally amplitude-modulated structure with a temperature dependent propagation wave vector (q q 0). These features of successive phase transitions are well explained by reinvestigated Monte-Carlo simulation of a 2D Ising TLA with competing exchange interactions up to 3rd neighbors, in spite of the Heisenberg spin character of orbital singlet Fe3+ magnetic ions.

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