Current-induced metallic behavior in Pr${}_{0.5}$Ca${}_{0.5}$MnO${}_3$ thin films: competition between Joule heating and nonlinear conduction mechanism

Abstract

Thin films of Pr0.5Ca0.5MnO3 manganites exhibiting charge/orbital-ordered properties with colossal magnetoresistance have been synthesized by the pulsed laser deposition technique on both (100)-SrTiO3 and (100)-LaAlO3 substrates. The effects of current-induced metallic-behavior of the films are investigated as a function of the temperature and the magnetic field. Calculations based on a heat transfer model across the substrate, and our resistivity measurements reveal effects of Joule heating on charge transport over certain ranges of temperatures and magnetic fields. Our results also indicate that a nonlinear conduction, which cannot be explained by homogeneous Joule heating of the film, is observed when the material is less resistive (10-2 W.cm). The origin of this behavior is explained with a model based on local thermal instabilities associated with phase-separation mechanism and a change in the long range charge-ordered state.

To be published in Phys. Rev. B

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• Transport properties of microstructured ultrathin films of La0.67Ca0.33MnO3 on SrTiO3
• Exchange coupling induced antiferromagnetic-ferromagnetic transition in $P{r}_{0.5}C{a}_{0.5}Mn{O}_3/L{a}_{0.5}C{a}_{0.5}Mn{O}_3$ superlattices
• Effect of strain on the electrical transport and magnetization of the epitaxial Pr0.5Ca0.5MnO3/La0.5Ca0.5MnO3/ Pr0.5Ca0.5MnO3 trilayer structures
• Evidence of mobile carriers with Charge Ordering gap in Epitaxial Pr${}_{0.625}$Ca${}_{0.375}$MnO${}_3$ Thin Films
• Growth and Characterization of Off-Stoichiometric LaVO${}_3$ Thin Films
• Crossover from magnetostatic to exchange coupling in La0.67Ca0.33MnO3/YBa2Cu3O7/La0.67Ca0.33MnO3 heterostructures