The phase transition “collapse” of magnetic moments of sublattices in segnetoantiferromagnetics in a strong magnetic field is considered. It is shown that spin fluctuations play an essential role and determine the characteristics of the phase transition. Consecutive accounting for the spin fluctuations by the renormalization group method and ɛ-expansion results in a phase transition in segnetoantiferromagnetics in a strong magnetic field that occurs at a first-order phase transition, which is close to second order for a nonzero relativistic constant of the magnetoelectric bond and any inductive capacity.
Faculty of Physics, Moscow State University, Moscow, 119899, Russia
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