Magnetoentropic signatures of skyrmionic phase behavior in FeGe

TL;DR

This paper shows that magnetocaloric measurements can quickly and accurately map the phase diagram of FeGe, revealing entropic signatures of skyrmionic phases and phase transitions, including latent heats and a Brazovskii transition.

Contribution

It introduces a magnetocaloric measurement approach to analyze skyrmion phase behavior and clarifies the phase diagram of FeGe with quantitative thermodynamic data.

Findings

Magnetocaloric measurements reveal skyrmionic phase boundaries.

Quantitative latent heats of magnetic transitions are obtained.

The phase diagram contains a single skyrmionic pocket and a Brazovskii transition.

Abstract

We demonstrate that magnetocaloric measurements can rapidly reveal details of the phase diagrams of high-temperature skyrmion hosts, concurrently yielding quantitative latent heats of the field-driven magnetic phase transitions. Our approach addresses an outstanding issue in the phase diagram of the skyrmion host FeGe by showing that dc magnetic anomalies can be explained in terms of entropic signatures consistent with a phase diagram containing a single pocket of skyrmionic order and a Brazovskii transition.