Temperature memory and resistive glassy behaviors of a perovskite manganite

TL;DR

This study investigates the resistive glassy behaviors, temperature memory, and aging phenomena in a ferromagnetic perovskite manganite, revealing magnetically originated glassy dynamics linked to phase separation and magnetic-electronic interactions.

Contribution

It demonstrates that hole-doped perovskite manganites exhibit resistive glassiness due to competing thermomagnetic processes, expanding understanding of glassy states in magnetic materials.

Findings

Observation of long-time relaxation and aging in resistance and magnetization.

Identification of magnetic origin of electrical transport glassiness.

Proposal of resistive glasses in hole-doped manganites.

Abstract

This paper reports the observations of long-time relaxation, aging, and temperature memory behaviors of resistance and magnetization in the ferromagnetic state of a polycrystalline La0.7Ca0.3Mn0.925Ti0.075O3 compound. The observed glassy dynamics of the electrical transport appears to be magnetically originated and has a very close association with the magnetic glassiness of the sample. Phase separation and strong correlation between magnetic interactions and electronic conduction play the essential roles in producing such a resistive glassiness. We explain the observed effects in terms of a coexistence of two competing thermomagnetic processes, domain growth and magnetic freezing, and propose that hole-doped perovskite manganites can be considered as "resistive glasses".