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Two Types of Low‐Temperature Phase Transitions in Uniaxial Ferromagnets with High Single‐Ion Anisotropy
Author(s) -
Kazakov A. A.
Publication year - 1984
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.2221210118
Subject(s) - condensed matter physics , anisotropy , magnon , ferromagnetism , dispersion (optics) , ion , magnetization , character (mathematics) , materials science , phase (matter) , physics , magnetic field , quantum mechanics , geometry , mathematics
It is mentioned, that the low‐temperature exchange hybridization of magnon modes in the uniaxial strongly anisotropic crystals with single‐ion anisotropy results in the presence of special points in magnon spectrum, where the energetic gaps become equal zero, and the dispersion mode law is of power character. The physical nature of this peculiarities occurrence is connected with the level crossing. It is shown, that the influence of these points essentially tells on the low‐temperature behaviour of magnetization and its derivatives by field and temperature.