Abstract
The authors have investigated the electrical transport properties of 8nm thick La0.67Ca0.33MnO3 (LCMO) films, sputter deposited on SrTiO3 (STO), and etched into 5μm wide bridges by Ar-ion etching. The authors find that even slight overetching of the film leads to conductance of the STO substrate, and asymmetric and nonlinear current-voltage (I-V) characteristics. However, a brief oxygen plasma etch allows full recovery of the insulating character of the substrate. The I-V characteristics of the bridges are then fully linear over a large range of current densities. The authors find colossal magnetoresistance properties typical for strained LCMO on STO but no signature of nonlinear effects (the so-called electroresistance) connected to electronic inhomogeneites. In the metallic state below 150K, the highest current densities lead to heating effects and nonlinear I-V characteristics.
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