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Phase Diagrams of Ferromagnets with Cubic Single‐Ion Anisotropy
Author(s) -
Domański Z.,
Sznajd J.
Publication year - 1985
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.2221290113
Subject(s) - condensed matter physics , hamiltonian (control theory) , ferromagnetism , phase diagram , anisotropy , phase transition , magnetization , physics , ion , phase (matter) , quantum mechanics , mathematics , magnetic field , mathematical optimization
The phase diagrams of S = 2 and 5/2 ferromagnets described by an Hamiltonian with a cubic single‐ion anisotropy term are discussed. It is shown that in the case of S = 2 the sixth‐order terms in the LGW Hamiltonian do not change the qualitative picture of the phase diagram, recently presented, only shifting the tricritical points. On the basis of the RG results it is found that for S = 5/2 the phase transition to the state with magnetization along [111] direction ought to be continuous whereas that to the state [001] is a discontinuous one.