Colossal magnetoresistance in epitaxial La(1−x−y)NayMnO3 thin film

Abstract

We have synthesized ${\mathrm{La}}_{\mathrm{0.83}}{\mathrm{Na}}_{\mathrm{0.11}}{\mathrm{MnO}}_{\mathrm{2.93}}$ by heating ${\mathrm{La}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{3}}$ and ${\mathrm{MnCO}}_{\mathrm{3}}$ in NaCl melt at 900 °C. The exact composition was arrived by analyzing each ion by an independent chemical method. The compound crystallized in a rhombohedral structure and showed an insulator-to-metal transition at 290 K. Epitaxial thin films were fabricated on ${\mathrm{LaAlO}}_{\mathrm{3}}$ (100) using a pulsed laser deposition technique. The film also showed an insulator-to-metal transition at 290 K. Magnetoresistance ${\mathrm{[\Delta R/R}}_0{\mathrm{=(R}}_H{\mathrm{-R}}_0{\mathrm{)/R}}_0]$ was $\text{−71\%}$ near the insulator-to-metal transition temperature of 290 K at 6 T magnetic field.