Magnetic relaxation in La0.250Pr0.375Ca0.375MnO3 with varying phase separation

TL;DR

This study investigates the magnetic relaxation behavior of phase-separated La0.250Pr0.375Ca0.375MnO3, revealing two distinct relaxation processes linked to domain reorientation and phase transformation, influenced by temperature and magnetic field.

Contribution

It provides new insights into the magnetic relaxation mechanisms in phase-separated manganites with varying phase fractions due to different sintering conditions.

Findings

Two types of relaxation processes identified: domain reorientation at low fields and phase transformation at high fields.

Magnetic viscosity depends on temperature and magnetic field, correlating with static magnetic properties.

Phase fraction variation affects relaxation behavior in the studied manganite samples.

Abstract

We have studied the magnetic relaxation properties of the phase-separated manganite compound La0.250Pr0.375Ca0.375MnO3 . A series of polycrystalline samples was prepared with different sintering temperatures, resulting in a continuous variation of phase fraction between metallic (ferromagnetic) and charge-ordered phases at low temperatures. Measurements of the magnetic viscosity show a temperature and field dependence which can be correlated to the static properties. Common to all the samples, there appears to be two types of relaxation processes - at low fields associated with the reorientation of ferromagnetic domains and at higher fields associated with the transformation between ferromagnetic and non-ferromagnetic phases.