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We emphasize the role of temperature in explaining the IV ovonic thresholdswitching curve of amorphous phase change materials. The Poole-Frankelconduction model is supplemented by considering effects of temperature on theconductivity in amorphous materials and we find agreement with a wide varietyof available data. This leads to a simple explanation of the snapback inthreshold switching. We also argue that low frequency current noise in theamorphous state originates from trains of moving charge carriers derailing andrestarting due to the different local structures within the amorphous material.

Threshold conduction in amorphous phase change materials: effects of temperature