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VOLUME 28 (1978) | ISSUE 6 | PAGE 351
Lowering of the optical class of an antiferromagnetic crystal, induced by a longitudinal magnetic field
It was observed in experiment that a longitudinal magnetic field induces birefringence, linear in the field intensity, in a two-sublattice collinear tetragonal antiferromagnet in which linearly polarized light propagates along the tetragonal axis. The magnitude of the birefringence makes it possible to distinguish visually, in a magnetic field, antiferromagnetic states that have different directions of the antiferromagnetic vector. It is shown that the distortions in the tetragonal-structure field are not the decisive factor in the observed magneto-optical effect.