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The mean field phase diagrams of YbIG
Author(s) -
Loos J.
Publication year - 1977
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.2220840208
Subject(s) - ferrimagnetism , metastability , hamiltonian (control theory) , condensed matter physics , phase transition , symmetry (geometry) , phase diagram , potts model , physics , magnetic field , multicritical point , phase boundary , first order , phase (matter) , mathematical physics , magnetization , mathematics , quantum mechanics , geometry , mathematical optimization
The existence of the symmetry allowed magnetic phases in ferrimagnetic YbIG is discussed. The continuous and quasi‐continous transformations of these phases are treated using the thermodynamic potential expansions whose coefficients are determined from the well known effective spin Hamiltonian of Yb ions. The special cases with the magnetic field H along the <100>, <111> and <110> symmetry directions are dealt with. The existence of a low symmetry phase connected with the occurrence of a tetracritical point is stated for H ∥ <110>. The collinear‐canted phase transition is of the first order for H ∥ <111> but at high fields quasi‐continuous with a very narrow metastability region. An isolated critical point, in which three first‐order and two second‐order transition lines meet, is found on this first‐order phase boundary. The connection with the Potts model is outlined. The calculated phase diagrams are compared with experimental results.