The structural transition induced by the magnetic field in the crystal with strong anisotropy of the rare-earth ions g-tensor

The theoretical description is given of the structural phase transition in the magnetic field, caused by a strong anisotropy of the magnetic ion g-tensor and the magnetic analog of Jan-Teller effect. The interaction of the structural order parameter with the magnetic field is modelled. Obtained results show a good fits with the experimental data for KEr(MoO4)(2) crystal.