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.
@article{arxiv.2302.13845,
title = {Ferromagnetism and Metal-Insulator transition in F-doped LaMnO3},
author = {Ekta Yadav and Pramod Ghising and K. P. Rajeev and Z. Hossain},
journal= {arXiv preprint arXiv:2302.13845},
year = {2023}
}