Complex magnetic phase diagram in noncentrosymmetric EuPtAs

TL;DR

This study reveals a complex magnetic phase diagram in EuPtAs, showing multiple magnetic transitions and field-induced phases, highlighting rich magnetic behavior in a noncentrosymmetric material.

Contribution

It presents the first detailed magnetic phase diagram of EuPtAs, uncovering multiple transitions and domain behaviors in a noncentrosymmetric Eu-based compound.

Findings

Multiple magnetic transitions at 14.8 K and 7.5 K.

Field-induced complex magnetic phases with dome-like structure.

Presence of multiple antiferromagnetic domains.

Abstract

We report the observation of multiple magnetic transitions in single crystals of EuPtAs using magnetization, transport, and thermodynamic measurements. EuPtAs crystallizes in the noncentrosymmetric tetragonal LaPtSi-type structure (space group I41md) and undergoes a second-order antiferromagnetic transition at 14.8 K, which is followed by a first-order transition at about 7.5 K. Both transitions are suppressed by magnetic fields applied parallel and perpendicular to the c axis, and multiple field-induced transitions are observed for both field directions, leading to complex temperature-field diagrams with a dome-like magnetic phase for fields parallel to the c axis. Moreover, the dependence of the low temperature resistivity on the application of a training field, but the lack of remanent magnetization, suggests the presence of multiple antiferromagnetic domains in zero-field.