Near room-temperature colossal magnetodielectricity and multiglass properties in partially-disordered La2NiMnO6

TL;DR

This study demonstrates that partially-disordered La2NiMnO6 exhibits near room-temperature colossal magnetodielectricity and multiglass behavior, achieved through engineering asymmetric hopping and spin orientation tuning, independent of striction effects.

Contribution

It reveals a new mechanism for colossal magnetodielectricity in transition metal oxides by controlling spin and disorder without relying on striction effects.

Findings

Large magnetodielectric coupling of 8-20% between 150-300 K.

Identification of La2NiMnO6 as a true multiglass system.

Colossal magnetodielectricity achieved via asymmetric hopping control.

Abstract

We report magnetic, dielectric and magnetodielectric responses of pure monoclinic bulk phase of partially-disordered La2NiMnO6, exhibiting a spectrum of unusual properties and establish that this system intrinsically is a true multiglass with a large magnetodielectric coupling (8-20%) over a wide range of temperatures (150 - 300 K). Specifically, our results establish a unique way to obtain colossal magnetodielectricity, independent of any striction effects, by engineering the asymmetric hopping contribution to the dielectric constant via the tuning of the relative spin orientations between neighboring magnetic ions in a transition metal oxide system. We discuss the role of anti-site (Ni-Mn) disorder in emergence of these unusual properties.