Anisotropic transport properties of charge-ordered La_5/8-yPr_yCa_3/8MnO₃ (y = 0.43) film

The anisotropic resistances along [001] and [1-10] axes are investigated for an La_5/8-yPr_yCa_3/8MnO₃ (y = 0.43) (LPCMO) film grown on (110)-oriented LaAlO₃ substrate. It is found that the charge order (CO) transition is much stronger and the resistance is larger along the [001] direction than that along the [1-10] direction. Special attention has been paid to the different effects of a magnetic field on the resistances of the two axes. The resistance is more susceptible to the magnetic field along the [001] direction compared with that along the [1-10] direction. Our results demonstrate that the anisotropic transport properties can be ascribed to the intrinsic anisotropic strain field in the film, which changes the shape of metallic domains for the phase separation manganite film. We also provide a feasible method to rule out the Joule heat effect from the electric current effect. This could be useful for future construction and application of materials and devices.