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Step-like negative differential resistance is observed in patterned Pr0.65(Ca0.75Sr0.25)0.35MnO3 structures with mesoscopic (micrometer) length scales. Key to the appearance of the steps is a field- and temperature-dependent mixture of ferromagnetic metal (FMM) and charge ordered insulating (COI) phases found in this material. Notably, such steps in the current-voltage curves have not been observed in bulk or unpatterned films of this material, suggesting that the commensurability between device dimensions and the size of competing FMM and COI domains are important conditions for observing this effect. We offer a semiquantitative resistor-network model of the steps that posits a local Joule heating-induced phase transition of FMM to COI.
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Wu et al. (2005) studied this question.
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