Spin-lattice coupling induced weak dynamical magnetism in EuTiO_3 at high temperatures

TL;DR

This study reveals that EuTiO_3 exhibits hidden weak dynamical magnetism at high temperatures due to spin-lattice coupling, demonstrated through magnetization and muon spin rotation experiments.

Contribution

The paper uncovers high-temperature weak magnetism in EuTiO_3 driven by spin-lattice interactions, a phenomenon not previously characterized.

Findings

Magnetization anomalies below 200 K increase with magnetic field.

Muon spin rotation confirms weak fluctuating bulk magnetism.

Spin-lattice coupling induces high-temperature magnetic fluctuations.

Abstract

EuTiO_3, which is a G-type antiferromagnet below T_N = 5.5 K, has some fascinating properties at high temperatures, suggesting that macroscopically hidden dynamically fluctuating weak magnetism exists at high temperatures. This conjecture is substantiated by magnetic field dependent magnetization measurements, which exhibit pronounced anomalies below 200 K becoming more distinctive with increasing magnetic field strength. Additional results from muon spin rotation (${\mu}$SR) experiments provide evidence for weak fluctuating bulk magnetism induced by spin-lattice coupling which is strongly supported in increasing magnetic field.