Abstract
Monte-Carlo and variational calculations are used to revise the phase diagram of the magnetically- frustrated material CuFeO2. For fields 50 T < H < 65 T, a new spin flop phase is predicted between a canted three-sublattice phase and the conventional conical spin-flop phase. This phase has wavevector Q (0.8 , 0.43 ) and is commensurate in the x direction but incommensurate in the y direction. A canted five-sublattice phase is predicted between the multiferroic phase and either a collinear five-sublattice phase for pure CuFeO2 or a canted three-sublattice phase for Al- or Ga-doped CuFeO2.
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