# Rotating magnetocaloric effect in the ferromagnetic Weyl semi-metal Co$_{3}$Sn$_{2}$S$_{2}$

## TL;DR

This study investigates the anisotropic magnetocaloric properties of Co$_{3}$Sn$_{2}$S$_{2}$, revealing a significant rotating magnetocaloric effect and critical behavior consistent with a second-order phase transition at 174 K.

## Contribution

It reports the first detailed analysis of the rotating magnetocaloric effect in a ferromagnetic Weyl semimetal, including critical exponents and universal scaling behavior.

## Key findings

- Significant (factor of 2) difference in magnetocaloric effect between orientations.
- Universal scaling of magnetic entropy change indicating second-order transition.
- Critical exponents consistent with recent critical behavior studies.

## Abstract

The rotating magnetocaloric effect (RMCE) is a recent interest in magnetic refrigeration technique in which the cooling effect is attained by rotating the anisotropic magnetocaloric material from one orientation to the other in a fixed magnetic field. In this work, we report the anisotropic magnetocaloric properties of single crystals of the ferromagnetic Weyl semimetal Co$_{3}$Sn$_{2}$S$_{2}$ for magnetic field $H\parallel c$ axis and $H\parallel ab$ plane. We observed a significant (factor of $2$) difference between the magnetocaloric effect measured in both orientations. The rotating magnetocaloric effect has been extracted by taking the difference of the magnetic entropy change ($\Delta S_{M}$) for fields applied in the two crystallographic orientations. In a scaling analysis of $\Delta S_{M}$, the rescaled $\Delta S_{M}(T,H)$ vs reduced temperature $\theta$ curves collapse onto a single universal curve, indicating that the transition from paramagnetic to ferromagnetic phase at 174~K is a second order transition. Furthermore, using the power law dependence of $\Delta S_{M}$ and relative cooling power RCP, the critical exponents $\beta$ and $\gamma$ are calculated, which are consistent with the recent critical behavior study on this compound \cite{Yan2018}.