A phenomenological thermodynamic potential for DyCo$_2$

TL;DR

This paper develops a Landau phenomenological thermodynamic model for DyCo2, accurately describing its magnetic transition behaviors and properties such as ferromagnetic transition temperature and magnetization curves.

Contribution

It introduces an eight-order polynomial Landau expansion based on symmetry analysis to model DyCo2's thermodynamic behavior, including metamagnetic transitions.

Findings

Successfully reproduces ferromagnetic transition temperature

Accurately models magnetization curves and temperature dependence

Predicts the metamagnetic transition near the Curie temperature

Abstract

A phenomenological thermodynamic potential was constructed based on the symmetry analysis and property characterization of bulk DyCo2. An eight-order polynomial of Landau expansion was employed to describe the thermodynamic behavior of DyCo2. Several properties were reproduced including ferromagnetic transition temperature, magnetization curve, temperature dependence of magnetization. The transition behavior was analyzed via the thermodynamic potential. The Landau phenomenological thermodynamic model predicts the correct metamagnetic transition near the Curie temperature.