Abstract
The temperature, magnetic field, and current dependence of the magnetotransport properties of a La0.8Ca0.2MnO3 film were studied in a regime of strong Joule heating. In current-voltage curves an abrupt hysteretic transition was observed which is induced by global and nondestructive Joule heating of the manganite film by a large electric current. The apparent magnetoresistance measured at an appropriate temperature/current parameter set is strongly enhanced by a feedback between magnetoresistance and Joule heating.
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