Field-Induced Magnetic Phase Transitions in a Triangular Lattice Antiferromagnet CuFeO<sub><b>2</b></sub>up to 14.5 T

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  • Mitsuda Setsuo
    Department of Physics, Faculty of Science, Science University of Tokyo,<BR>Kagurazaka, Shinjuku-ku, Tokyo 162-8601
  • Mase Motoshi
    Department of Physics, Faculty of Science, Science University of Tokyo,<BR>Kagurazaka, Shinjuku-ku, Tokyo 162-8601
  • Prokes K.
    Hahn-Meitner-Institute, Glienicker Stra{ß}e 100, D-14109 Berlin, Germany
  • Kitazawa Hideaki
    National Research Institute for Metals, Tsukuba-shi, Ibaraki 305-0047
  • Katori H. Aruga
    RIKEN (The Institute of Physical and Chemical Research) Wako, Saitama 351-0198

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  • Field-Induced Magnetic Phase Transitions in a Triangular Lattice Antiferromagnet CuFeO2 up to 14.5T.

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Neutron diffraction studies on a frustrated triangular lattice antiferromagnet (TLA) CuFeO2 have been performed under an applied magnetic field up to 14.5 T. The first-field-induced state was found to be not the commensurate 5-sublattice (↑ ↑ ↑ ↓ ↓ ) magnetic state but rather an incommensurate complex helical state reflecting the Heisenberg spin character of orbital singlet Fe3+ magnetic ions. In contrast, the second-field-induced state was found to be the 5-sublattice (↑ ↑ ↑ ↓ ↓ ) magnetic state predicted by the two-dimensional (2D) Ising spin TLA model with competing exchange interactions up to the 3rd neighbors.

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