# Magnetic phase diagram, magnetotransport and inverse magnetocaloric effect in the noncollinear antiferromagnet Mn$_5$Si$_3$

## TL;DR

This study synthesizes Mn$_5$Si$_3$ single crystals, maps its magnetic phase diagram, and investigates its magnetotransport properties, revealing multiple magnetic phases and potential strain-induced effects influencing its magnetic behavior.

## Contribution

First detailed phase diagram of Mn$_5$Si$_3$ including a ferromagnetic-like phase, with insights into strain effects and magnetic ordering from magnetization and transport measurements.

## Key findings

- Identification of collinear and noncollinear antiferromagnetic phases
- Discovery of an intermediate ferromagnetic-like phase
- Evidence of strain effects from Cu inclusions affecting magnetic order

## Abstract

The antiferromagnet Mn$_5$Si$_3$ has recently attracted attention because a noncollinear spin arrangement has been shown to produce a topological anomalous Hall effect and an inverse magnetocaloric effect. Here we synthesize single crystals of Mn$_5$Si$_3$ using flux growth. We determine the phase diagram through magnetization and measure the magnetoresistance and the Hall effect. We find the collinear and noncollinear antiferromagnetic phases at low temperatures and, in addition, a third magnetic phase, in between the two antiferromagnetic phases which has ferromagnetic character. The latter magnetic phase might be caused by strain produced by Cu inclusions that lead to quenched fluctuations of the mixed character magnetic ordering in this compound.