Correlation between electrical and magnetic properties of phase separated manganites studied with a General Effective Medium model

TL;DR

This study investigates the relationship between electrical and magnetic properties of phase-separated manganites using a General Effective Medium model, revealing that a mixed phase scenario explains observed behaviors.

Contribution

The paper introduces a method to determine ferromagnetic volume fraction from resistivity data using the General Effective Medium theory, aligning it with magnetization measurements.

Findings

Resistivity and magnetization data are in excellent agreement.

Mixed phase scenario effectively explains magnetic and transport properties.

The model accurately estimates ferromagnetic volume fraction as a function of temperature.

Abstract

We have performed electrical resistivity and DC magnetization measurements as a function of temperature, on polycrystalline samples of phase separated LaPrCaMnO. We have used the General Effective Medium Theory to obtain theoretical resistivity vs. temperature curves corresponding to different fixed ferromagnetic volume fraction values, assuming that the sample is a mixture of typical metallic like and insulating manganites. By comparing this data with our experimental resistivity curves we have obtained the relative ferromagnetic volume fraction of our sample as a function of temperature. This result matches with the corresponding magnetization data in excellent agreement, showing that a mixed phase scenario is the key element to explain both the magnetic and transport properties in the present compound.