Current-Controlled Negative Differential Resistance due to Joule Heating in TiO2

Details Current-Controlled Negative Differential Resistance due to Joule Heating in TiO2 Current-Controlled Negative Differential Resistance due to Joule Heating in TiO2

2011-08-15

arxiv.org/abs/1108.3120v1

Applied Physics Letters 99, 202104 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 2 figures

Scientific paper

We show that Joule heating causes current-controlled negative differential resistance (CC-NDR) in TiO2 by constructing an analytical model of the voltage-current V(I) characteristic based on polaronic transport for Ohm's Law and Newton's Law of Cooling, and fitting this model to experimental data. This threshold switching is the 'soft breakdown' observed during electroforming of TiO2 and other transition-metal-oxide based memristors, as well as a precursor to 'ON' or 'SET' switching of unipolar memristors from their high to their low resistance states. The shape of the V(I) curve is a sensitive indicator of the nature of the polaronic conduction.

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