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

TL;DR

This study investigates how the resistivity of La$_{0.75}$Ca$_{0.25}$MnO$_{3}$ varies with temperature and current, revealing current-dependent resistance near the Curie temperature due to inhomogeneous Joule heating and phase transition percolation.

Contribution

It demonstrates the influence of current-induced Joule heating on resistivity near the ferromagnetic-paramagnetic transition in manganites.

Findings

Resistivity depends significantly on current near $T_C$.

Inhomogeneous Joule heating affects the phase transition behavior.

Percolation effects are evident in the transition region.

Abstract

Temperature and current dependences of resistivity of bulk La$_{0.75}$Ca$_{0.25}$MnO$_{3}$ sample grown by the floating-zone method were studied using single ramp pulses of current. It is found that near the Curie temperature $T_C$ the sample resistance depends substantially on current magnitude. The observed features can be determined by inhomogeneous Joule overheating due to mixed phase state of manganites near the ferromagnetic-paramagnetic transition and percolation character of this transition.