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Temperature and current dependences of resistivity of bulkLa$_{0.75}$Ca$_{0.25}$MnO$_{3}$ sample grown by the floating-zone method werestudied using single ramp pulses of current. It is found that near the Curietemperature $T_C$ the sample resistance depends substantially on currentmagnitude. The observed features can be determined by inhomogeneous Jouleoverheating due to mixed phase state of manganites near theferromagnetic-paramagnetic transition and percolation character of thistransition.

Conductivity behavior of La$_{0.75}$Ca$_{0.25}$MnO$_{3}$ in vicinity of ferromagnetic-paramagnetic transition studied with single current pulses