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VOLUME 41 (1985) | ISSUE 9 | PAGE 391
Observation of a gap in the spin-wave spectrum in YFeO3 upon an orientational transition in a magnetic field
During spin flip in YFe03 induced by a magnetic field H||a, the antiferromagnetic resonant frequency does not vanish. It is predicted theoretically that the observed gap will have the behavior Vo~4x\\This transition, continuous in H, does not have the properties of a second-order phase transition.