Joule heating enhanced colossal magnetoresistance in La0.8Ca0.2MnO3 films

Appl. Phys. Lett. 89, 082501 (2006)

Y. F. Chen, M. Ziese, and P. Esquinazi


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.