Multiferroic behavior in CdCr2X4 (X = S, Se)

TL;DR

This paper investigates the multiferroic properties of CdCr2X4 (X=S, Se), revealing magnetocapacitive effects linked to magnetic ordering and dielectric relaxation changes, advancing understanding of multiferroic materials.

Contribution

It provides a detailed dielectric spectroscopy analysis of CdCr2X4, demonstrating the coupling between magnetic and electric properties and the influence of magnetic order on dielectric relaxation.

Findings

Magnetocapacitive effect observed at magnetic transition

Relaxor ferroelectricity coexists with ferromagnetism

Dielectric relaxation dynamics are significantly altered by magnetic order

Abstract

The recently discovered multiferroic material CdCr2S4 shows a coexistence of ferromagnetism and relaxor ferroelectricity together with a colossal magnetocapacitive effect. The complex dielectric permittivity of this compound and of the structurally related CdCr2Se4 was studied by means of broadband dielectric spectroscopy using different electrode materials. The observed magnetocapacitive coupling at the magnetic transition is driven by enormous changes of the relaxation dynamics induced by the development of magnetic order.