Temperature and magnetic field dependent transport anisotropies in La0.7Ca0.3MnO3 films

We report the temperature and field dependence of anisotropic magnetoresist ance (AMR) in fully strained tetragonal thin films of the colossal magnetor esistance manganite La0.7Ca0.3MnO3. The behavior of the AMR is very differe nt from that found in conventional metallic alloys. Its magnitude is peaked near the Curie temperature T-C and becomes small at low temperature. It ha s two distinct symmetry components: one twofold symmetric about the transpo rt current direction dominant near T-C, the other fourfold symmetric with s ymmetry axes of the crystal, appearing at low temperature. (C) 2000 America n Institute of Physics. [S0003-6951(00)03602-0].