"Kinematic" soft mode in metamagnets in the absence of phase transitions
Gufan Yu. M. , Rudashevskii E. G. , Sadkov A. N. , Tsivtsivadze T. A.
In the single-phase region in a metamagnet in a magnetic field, one of the frequencies of the spin-wave spectrum vanishes. The effect is not a consequence of the "softening" of the system which usually occurs at a phase transition.