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Characteristic Surfaces of Fluctuations and Critical Index for the Phase Transition in Uniaxial Ferromagnets
Author(s) -
Klamut J.,
Sznajd J.
Publication year - 1973
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220600236
Subject(s) - condensed matter physics , anisotropy , ferromagnetism , phase transition , magnetization , symmetry (geometry) , paramagnetism , phase (matter) , physics , magnetic field , quantum phase transition , magnetic anisotropy , field (mathematics) , materials science , quantum mechanics , geometry , mathematics , pure mathematics
Basing on Landau's theory which admits spatial inhomogeneities of the magnetization, the fluctuations near the ferro‐paramagnetic phase transition have been calculated. The magnetic anisotropy is shown to lead to anisotropic correlation functions which for a uniaxial ferromagnet lead to ellipsoidal isocorrelation surfaces with rotational symmetry, instead of the spherical symmetry assumed in the conventional Orstein‐Zernike theory. For the phase transition in the presence of an external magnetic field, the field and temperature dependence of the anisotropic correlation radii has been determined.