The role of fluctuations in spontaneous metamagnetism

摘要: A Landau–Ginzburg Hamiltonian involving coupled sublattice magnetizations as order parameters for spontaneous metamagnets is studied. brief review of the mean field results followed by an analysis role fluctuations which arise due to inhomogeneity terms in Hamiltonian. Using a Gaussian approach specific heat contribution from normal modes studied neglecting mode‐mode coupling. non‐Gaussian problem also outlined. While finite sizes shows no anomalies, thermodynamic limit classical exponents are recovered. The kinetics transition described Euler–Lagrange equations result two nonlinearly nonlinear Klein–Gordon equations. Special solutions obtained particular ansatz include solitons and elliptic waves whose physical interpretation provided.