Abstract
Liquid selenium shows a reversible switching to high conductance, which is effected by an electric field. A further increase of the electric field produces a reversible switching to low conductance. After switching to low conductance a voltage controlled negative resistance was observed. In a certain temperature range (dependent on the shape of the sample) a positive resistance after switching to low conductance was measured and a memory on switching back. In order to explain these switchings and the negative resistance, the authors suggest a model by assuming localized states at the top and bottom, and extended states in the middle of the conduction band. The measurements are extended up to 1000 degrees C.
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