The effect of an external magnetic field on the gas-liquid transition in the Ising spin fluid

TL;DR

This paper presents theoretical phase diagrams of an Ising lattice fluid under an external magnetic field, revealing complex effects on the gas-liquid transition influenced by nonmagnetic interactions and correlations.

Contribution

It introduces a theoretical framework for understanding how external magnetic fields affect gas-liquid transitions in Ising spin fluids, considering nonmagnetic interactions and short-range correlations.

Findings

External magnetic field influences the gas-liquid critical temperature.

Nonmonotonic effects of the magnetic field depend on nonmagnetic interaction strength.

Short-range correlations affect the Curie temperature in the model.

Abstract

The theoretical phase diagrams of the magnetic (Ising) lattice fluid in an external magnetic field is presented. It is shown that, depending on the strength of the nonmagnetic interaction between particles, various effects of external field on the Ising fluid take place. In particular, at moderate values of the nonmagnetic attraction the field effect on the gas-liquid critical temperature is nonmonotoneous. A justification of such behavior is given. If short-range correlations are taken into account (within a cluster approach), the Curie temperature also depend on the nonmagnetic interaction.