The effect of an external magnetic field on the gas-liquid transition in the Heisenberg spin fluid
Abstract
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 nonmonotoneous effect of fields on the temperature of the gas-liquid critical point is found. Within the mean spherical approximation this nonmonotoneous behavior disappears for short-range enough spin-spin interactions.
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