Effect of an external magnetic field on the gas-liquid transition in the Heisenberg spin fluid

摘要

We present the theoretical phase diagrams of the classical Heisenberg fluid in an external magnetic field. A consistent account of correlations is carried out by the integral equation method. A nonmonotonic effect of fields on the temperature of the gas-liquid critical point is found. Within the mean spherical approximation this nonmonotonic behavior disappears for short-range enough spin-spin interactions. [References: 14]