The origin of the glassy magnetic dynamics of the phase segregated state in perovskites

TL;DR

This paper investigates the glassy magnetic dynamics in phase segregated states of rare earth perovskites, revealing that interparticle interactions drive collective effects rather than exchange competition.

Contribution

It provides new insights into the origin of glassy behavior, emphasizing the role of interparticle interactions and analyzing critical exponents in the phase segregated state.

Findings

Magnetic relaxation indicates interparticle interactions cause collective effects.

Critical exponents differ from those of conventional spin-glasses.

Phase segregated state acts as a self-organized magnetic particle assembly.

Abstract

In this paper we address many of the fundamental open questions regarding the glassy behavior of the magnetic/electronic phase segregated state in rare earth perovskites. In particular, magnetic relaxation experiments support that the collective effects (memory, ageing, etc.) are due to interparticle interactions, rather than the double-exchange vs. superexchange competition. A careful study of the non-linear susceptibility in the critical region is performed, and the critical exponents contrasted with those of conventional spin-glasses and concentrated quenched ferrofluids. The phase segregated state constitutes a sort of self-generated assembly of magnetic particles in which magnetic interaction introduces collectivity among the clusters.