Abstract
AbstractUsing 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.
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