Multiferroicity of CuCrO2 tested by ESR

TL;DR

This study investigates the multiferroic properties of CuCrO2 using ESR, revealing electric field-induced shifts in spectra and dynamics linked to spin and polarization oscillations, aligning with theoretical models.

Contribution

It provides experimental evidence of electric field effects on ESR spectra in CuCrO2, advancing understanding of its multiferroic behavior and confirming theoretical predictions.

Findings

Electric field causes measurable ESR spectrum shifts.

Low-frequency dynamics involve coupled spin and polarization oscillations.

Results agree with phenomenological theoretical models.

Abstract

We have carried out the ESR study of the multiferroic triangular antiferromagnet CuCrO2 in the presence of an electric field. The shift of ESR spectra by the electric field was observed; the observed value of the shift exceeds that one in materials with linear magnetoelectric coupling. It was shown that the low-frequency dynamics of magnetically ordered CuCrO2 is defined by joint oscillations of the spin plane and electric polarization. The results demonstrate qualitative and quantitative agreement with theoretical expectations of a phenomenological model (V.I. Marchenko (2014)).