Spectral observation of the phase transition induced in iron fluoride by a strong magnetic field

exact estimate can be obtained, for example, from Eq, (4.1) of ref. 7.In the vicinity of the transition, besides the weakly ferromagnetic phase, it is natural to expect the appearance of an antiferromagnetic phase.' )Theoret ic al a nd experimental phase diagrams of the Morin type for rare earth orthoferrites were e xamined in ref. 9.

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