Thermodynamic investigations in the precursor region of FeGe

TL;DR

This study provides detailed thermodynamic measurements of FeGe, revealing a complex magnetic phase diagram with multiple phases and boundaries near the magnetic ordering temperature.

Contribution

It offers high-resolution magnetization and heat capacity data that clarify the complex magnetic phases and transitions in FeGe near its ordering temperature.

Findings

Identification of a segmented A-phase region.

Detection of phase boundaries and crossovers.

Complex magnetic phase diagram with anomalies.

Abstract

High-resolution DC magnetization and AC-specific heat data of the cubic helimagnet FeGe have been measured as function of temperature and magnetic field. The magnetization data as well as the isothermal susceptibility data confirm the complexity of the magnetic phase diagram in the vicinity of the onset of long-rang magnetic order (Tc = 278.5 K) and the existence of a segmented A-phase region. Moreover, these data revealed independent and clear indications of phase boundaries and crossovers within the A-phase region. Together with the anomalies in the specific-heat data around Tc and at small magnetic fields (H < 600 Oe) a complex magnetic phase diagram of FeGe is obtained.