Magnetodielectric Effects from Spin Fluctuations in Isostructural Ferromagnetic and Antiferromagnetic Systems

TL;DR

This study investigates how spin fluctuations and magnetic order influence the dielectric properties of isostructural ferromagnetic and antiferromagnetic materials, revealing potential for enhanced magnetodielectric effects near transition temperatures.

Contribution

It introduces a model linking polarization to spin correlations, explaining differing behaviors in ferromagnetic and antiferromagnetic systems, and highlights the potential for practical magnetodielectric applications.

Findings

Large magnetocapacitance observed near transition temperature in SeCuO3

Model explains contrasting behaviors in ferromagnetic and antiferromagnetic systems

Potential routes identified for enhancing magnetodielectric responses

Abstract

We report on the effects of spin fluctuations, magnetic ordering, and external magnetic field on the dielectric constant of the ferromagnet SeCuO3, and the antiferromagnet TeCuO3. A model based on the coupling between uniform polarization and the q-dependent spin-spin correlation function is presented to explain the different behaviors for these isostructural compounds. The large magnetocapacitance near the transition temperature in the ferromagnet SeCuO3 suggests routes to enhancing the magnetodielectric response for practical applications.