Scaling Study and Thermodynamic Properties of the cubic Helimagnet FeGe

TL;DR

This study investigates the critical magnetic behavior and thermodynamic properties of the cubic helimagnet FeGe near its transition temperature, confirming its classification within the 3D-Heisenberg universality class.

Contribution

The paper provides a detailed scaling analysis of FeGe's critical behavior and confirms its thermodynamic properties align with ab initio phonon calculations, highlighting its localized magnetic moments.

Findings

Critical exponents match 3D-Heisenberg universality class

Specific heat anomaly described by critical exponent α

Thermodynamic data consistent with localized magnetic moments

Abstract

The critical behavior of the cubic helimagnet FeGe was obtained from isothermal magnetization data in very close vicinity of the ordering temperature. A thorough and consistent scaling analysis of these data revealed the critical exponents $\beta=0.368$, $\gamma=1.382$, and $\delta=4.787$. The anomaly in the specific heat associated with the magnetic ordering can be well described by the critical exponent $\alpha=-0.133$. The values of these exponents corroborate that the magnetic phase transition in FeGe belongs to the isotropic 3D-Heisenberg universality class. The specific heat data are well described by ab initio phonon calculations and confirm the localized character of the magnetic moments.