Quantum-classical transition of the escape rate of uniaxial antiferromagnetic particles in an arbitrarily directed field

TL;DR

This paper investigates how the escape rate transition in uniaxial antiferromagnetic particles depends on an arbitrarily directed magnetic field, revealing the influence of longitudinal fields and non-compensation effects on phase transition boundaries.

Contribution

It provides a detailed analysis of the phase boundary between first- and second-order transitions in antiferromagnetic particles under complex magnetic field configurations.

Findings

Phase boundary line between transition types calculated.

Effects of longitudinal magnetic field vary with non-compensation.

Phase diagrams illustrating transition behaviors obtained.

Abstract

Quantum-classical escape rate transition has been studied for uniaxial antiferromagnetic particles with an arbitrarily directed magnetic field. In the case that the transverse and longitudinal fileds coexist, we calculate the phase boundary line between first- and second-order transitions, from which phase diagrams can be obtained. It is shown that the effects of the applied longitudinal magnetic field on quantum-classical transition vary greatly for different relative magnitudes of the non-compensation.