Calculation of the entropy of a classical Heisenberg ferromagnet based on the approximation of two-particle distribution functions
Abstract:
The paper presents a new method for directly calculating the entropy of a classical Heisenberg magnet based on the approximation of a two-particle distribution function. Such an approximation, taking into account the correlations between magnetic moments, is also the basis for creating a system of equations of correlation magnetodynamics. The method presented in the paper is approximate, does not have a strict justification and can be considered as a certain expansion, each subsequent member of which, based on the highest distribution functions, allows to increase the accuracy. The efficiency of the method is demonstrated in a large series of computational experiments for three types of crystal lattice (primitive, body-centered and face-centered) in a wide range of parameters.
