Current localization and Joule self-heating effects in Cr doped Nd0.5Ca0.5MnO3 manganites

Abstract

The effects of dc excitation current on the current-voltage curves of polycrystalline samples of Nd0.5Ca0.5Mn0.96Cr0.04O3 were investigated. The experimental results show that an abrupt jump of the voltage is concomitant with a huge increase in the temperature of the sample. A simple model and estimates for Joule self-heating effects support the experimental data. Moreover, the data strongly suggest that both the current localization in the metallic paths and local Joule self-heating effects are essential ingredients to understand the current-induced phase transition in phase-separated manganites.

Accepted for publication as a Brief Report in Physical Review B (2006)

References in corpus (3)

• Non-linear electrical response in a non-charge-ordered manganite: Pr0.8Ca0.2MnO3
• Current-induced metallic behavior in Pr${}_{0.5}$Ca${}_{0.5}$MnO${}_3$ thin films: competition between Joule heating and nonlinear conduction mechanism
• Non-linear electrical response in a charge/orbital ordered ${\mathrm{Pr}}_{0.63}$Ca${}_{0.37}$MnO${}_3$ crystal : the charge density wave analogy

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• Pulse width controlled resistivity switching at room temperature in Bi0.8Sr0.2MnO3
• Current-driven orbital order-disorder transition in LaMnO3
• Voltage control of spin resonance in phase change materials
• Current-induced electroresistance in Nd0.5Ca0.5Mn0.95Ni0.05O3
• Magnetothermal cooling with a phase separated manganite