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Theory of the Dependence of the Phase Boundary of FeBr 2 Metamagnet on Hydrostatic Pressure
Author(s) -
Onyszkiewicz Z.
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.2221220219
Subject(s) - ising model , hydrostatic pressure , condensed matter physics , phase diagram , hydrostatic equilibrium , spin (aerodynamics) , phase boundary , metamagnetism , phase (matter) , boundary (topology) , physics , thermodynamics , materials science , mathematics , magnetic field , magnetization , quantum mechanics , mathematical analysis
A two‐sublattice Ising model is proposed with special four‐spin interactions added in order to describe the FeBr 2 metamagnet. The important fact is that the four‐spin interaction terms are not even functions of spin sublattice operators. Thermodynamical properties of this model are investigated in the molecular field. The complete phase diagrams for FeBr 2 as functions of hydrostatic pressure are obtained numerically. Moreover the theoretical results are compared with experiment.