Positive magnetoresistance of La$_{0.7}$Sr$_{0.3}$MnO$_{3}$/C Composites at room temperature

Two-phase composites $x$La$_{0.7}$Sr$_{0.3}$MnO$_{3}$/(100-$x$)C ($x$ = 5–85 mass %) have been synthesized. The magnetoresistive properties of these materials in magnetic fields from 0 to 15 kOe have been investigated. It has been shown that, at room temperature, the positive isotropic magnetoresistance for samples with $x$ = 50–60 mass % reaches 15%.