Temperature and voltage driven tunable metal-insulator transition in individual WxV1-xO2 nanowires
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Results from transport measurements in individual WxV1-xO2nanowires with varying extents of W doping are presented. An abrupt thermally driven metal-insulator transition (MIT) is observed in these wires and the transition temperature decreases with increasing W content at a pronounced rate of -(48-56) K/at.% W, suggesting a significant alteration of the phase diagram from the bulk. These nanowires can also be driven through a voltage-driven MIT and the temperature dependence of the insulator-to-metal and metal-to-insulator switchings are studied. While driving from an insulator to metal, the threshold voltage at which the MIT occurs follows an exponential temperature dependence [VTHexp(-T/T0)], whereas driving from a metal to insulator, the threshold voltage follows VTHTc-T and the implications of these results are discussed. 2011 American Physical Society.