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    [13] Phase transition in non-collinear ordering without frustration
    D. Loison , Phys. Lett. A 264 (1999) 208
    We study a Heisenberg and $XY$ model on a cubic lattice with a cubic exchange coupling having a non--collinear ground state not due to frustration. This model has attractive properties: complex breakdown of symmetry, temperature dependence of the angles between the spins and phase transitions between ordered phases.
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