Unusual current‐voltage characteristics of single crystalline and bicrystalline La_0.7Ca_0.3MnO₃ films

Abstract

The current‐voltage characteristics of single crystalline and bicrystalline La0.7Ca0.3MnO3 films were measured and analyzed. Several epitaxial films, as well as 45° [001]‐tilt grain boundaries, display current‐voltage characteristics which are asymmetric with respect to polarity reversal of the bias current. One epitaxial film has a polarity dependent resistance of ∼340kΩ and of ∼670kΩ in forward and in reverse direction, respectively.