Abstract
Through the spin-wave theory we have calculated the thermodynamic phase boundary which separates the antiferromagnetic and spin-flop phases of anisotropic antiferromagnets. While spin-wave theories predict a minimum as a function of the temperature for the limits of stability of both phases, our results show that this minimum does not appear for the thermodynamic phase boundary. We also show that in the case of single-ion uniaxial anisotropy the thermodynamic field increases with the temperature according a T72 law.
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