Ai. Tovstolytkin et al., Double-peaked character of the temperature dependence of resistance of perovskite manganites for a broadened ferromagnetic transition, LOW TEMP PH, 25(12), 1999, pp. 962-965
The behavior of a system consisting of a mixture of paramagnetic semiconduc
ting and ferromagnetic metallic phases is examined in the framework of the
percolation model. As the temperature decreases below the Curie point, the
paramagnetic phase fraction is assumed to decreases according to an exponen
tial law. The evolution of the temperature variation of the resulting resis
tance is considered as a function of the magnetic transition broadening. An
explanation is offered for the low-temperature resistance anomaly observed
experimentally in a number of perovskite manganites. (C) 1999 American Ins
titute of Physics. [S1063-777X(99)00612-X].