Original Paper
Correlation of the electrical transport in epitaxial La2/3Ca1/3MnO3 thin films with magnetization
Abstract
We measured the magnetization M(T,H) and resistivity ρ(T,H) of epitaxial c-axis oriented films of the metallic ferromagnetic perovskite La2/3Ca1/3MnO3 as function of temperature and external magnetic field. The films were prepared by dc-sputtering at high oxygen pressure onto (001) SrTiO3 substrates without additional oxygen annealing. Ferromagnetic ordering was observed below a temperature TC ≈ 260 K where a negative magnetoresistance ratio of 50% was achieved in a magnetic field of 6 T. Above TC, the zero field resistivity exhibits polaron-hopping like activated conduction. The relation ρ(T,H) ∝ exp[-M(H,T)/M0] observed below TC suggests a direct connection between magnetization and resistivity.
