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Bethe‐Peierls study of magnetic field induced phase transitions
Author(s) -
Paraskevaidis C. E.,
Papatriantafillou C. T.
Publication year - 1986
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.2221350215
Subject(s) - condensed matter physics , phase diagram , ising model , magnetic field , antiferromagnetism , phase boundary , phase transition , physics , monte carlo method , phase (matter) , field (mathematics) , quantum mechanics , mathematics , statistics , pure mathematics
Using a Bethe‐Peierls like approach the thermodynamic behavior of a two‐sublattice Ising antiferromagnet is studied focusing on low temperatures and high magnetic fields portion of its phase diagram, where the system undergoes magnetic field‐induced phase transitions. The results for the H ‐ T phase diagram agree quite well with those from Monte Carlo calculations and show a „peculiar” boundary at low temperatures and high magnetic fields separating the AF from the PM state in which, in a certain narrow range of magnetic field values, the system undergoes an AF to PM phase transition both by increasing or decreasing the temperature at constant magnetic field. The behavior of the system is investigated in this „peculiar” regime by calculating the relevant thermodynamic quantities and a qualitatively symmetric behavior at the two AF to PM transition points with respect to the two directions of temperature variation at constant field is found.