Magnetotransport and hysteretic behavior in epitaxial La_0.67Ca_0.33MnO_3−δ films Available to Purchase

We have fabricated epitaxial La_0.67Ca_0.33MnO_3−δ thin films using pulsed laser deposition and performed subsequent thermal treatments. Magnetoresistance values as large as 14 000% (Δρ/ρ_H) were obtained. Above magnetic ordering temperatures, we observed a thermally activated conductivity that also has a quadratic magnetic field dependence. At low temperatures, we found a large hysteresis in the magnetoresistance that correlates with an unusual magnetic hysteresis curve. We interpret the hysteretic behavior as the result of a ‘‘frozen‐in’’ canted spin structure. Our results suggest that the electron conduction in this material is most sensitive to the canting angle of the neighboring Mn spins.