# Ferromagnetism and Metal-Insulator transition in F-doped LaMnO3

## TL;DR

This study investigates fluorine-doped LaMnO3, revealing ferromagnetic and metallic behavior with high Curie temperature and magnetoresistance, driven by mixed-valence Mn ions enabling double exchange, and identifies multiple resistivity peaks indicating complex conduction paths.

## Contribution

It demonstrates that F-doping induces ferromagnetism and metallicity in LaMnO3, highlighting the role of mixed-valence Mn ions and multiple double exchange pathways.

## Key findings

- High Curie temperature (~239 K) and magnetoresistance (-64%) in LaMnO2.5F0.5.
- Presence of two resistivity peaks at 239 K and 213 K.
- Multiple double exchange conduction paths below 213 K.

## Abstract

We present our studies on polycrystalline samples of fluorine doped LaMnO3 (LaMnO3-yFy). LaMnO2.5F0.5 exhibits remarkable magnetic and electrical properties. It shows ferromagnetic and metallic behavior with a high Curie temperature of ~ 239 K and a high magnetoresistance of -64. This drastic change in magnetic properties in comparison to pure LaMnO3 is ascribed to the presence of mixed-valence Mn ions driven by the F-doping at the O-sites, which enables double exchange (DE) in LMOF. Furthermore, the resistivity data exhibits two resistivity peaks at 239 K and 213 K, respectively. Our results point towards the possibility of multiple double exchange hopping paths of two distinct resistances existing simultaneously in the sample below 213 K.