Fe ion doping effect on electrical and magnetic properties of La0.7Ca0.3Mn1-xFexO3 x = 0.0 to 1.0

TL;DR

This study investigates how Fe ion doping affects the structural, electrical, and magnetic properties of La0.7Ca0.3MnO3, revealing changes in volume, magnetic interactions, and suppression of the insulator-metal transition.

Contribution

It provides new insights into Fe doping effects on La0.7Ca0.3MnO3's properties, highlighting the role of Fe3+ in magnetic and electrical behavior.

Findings

Fe doping increases unit cell volume.

Fe3+ ions substitute Mn3+ ions and promote anti-ferromagnetism.

Fe doping suppresses the insulator-metal transition temperature.

Abstract

Here we report the structural, electrical and magnetic properties of Fe doped La0.7Ca0.3Mn1-xFexO3 with x = 0.0 to 1.0 prepared by conventional solid state reaction method. Simulated data on XRD shows an increase in volume with an increase in Fe ion concentration. XPS supports that Fe3+ ions directly substitute Mn3+ ions. Shifting towards lower wave-number and symmetric IR band structure confirms increase in volume and homogeneous distribution of Fe ions. Fe ion doesn't contribute in double-exchange (DE) conduction mechanism due to its stable half filled 3d orbital. The presence of Fe3+ ions encourages anti-ferromagnetism (AFM) generated by super-exchange interaction and suppress insulator-metal transition temperature (TIM). Magnetic measurements show the existence of magnetic polarons supported by increase in volume of unit cell and deviation from Curie-Weiss law.