The magnetic phase of the perovskite CaCrO$_3$ studied with $\mu^{+}$SR

TL;DR

This study uses muon spin relaxation and susceptibility measurements to analyze the magnetic phase of CaCrO$_3$, revealing antiferromagnetic order below 90 K and suggesting a magneto-elastic mechanism above this temperature.

Contribution

It provides detailed insights into the magnetic ordering and lattice interactions in CaCrO$_3$ using muon spin relaxation techniques.

Findings

Identification of a 1 K thermal hysteresis at the transition.

Detection of static antiferromagnetic order below 90 K.

Evidence of lattice deformations above the transition temperature.

Abstract

We investigated the magnetic phase of the perovskite CaCrO$_3$ by using the muon spin relaxation technique accompanied by susceptibility measurements. A thermal hysteresis loop is identified with a width of about 1 K at the transition temperature. Within the time scale of the muon lifetime, a static antiferromagnetic order is revealed with distinct multiple internal fields which are experienced in the muon interstitial sites below the phase-transition temperature, $T_N=90 K$. Above $T_N$, lattice deformations are indicated by transverse-field muon-spin rotation and relaxation suggesting a magneto-elastic mechanism.