Transition from supercurrent to coulomb blockade tuned by anodization of Nb wires
Mesoscopic Systems
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Abstract
We have fabricated small high-ohmic resistors by anodic oxidation of Nb wires, monitoring and trimming the resistancein situ during the anodization. At millikelvin temperatures, the current-voltage characteristics of these resistors are nonlinear around zero bias. Wires with a low sheet resistance show a supercurrent feature, while higher resistive ones exhibit a sharp blockade that can be partially suppressed by external magnetic fields. The onset of a strong blockade occurs when the sheet resistance exceeds a value of the order of the resistance quantumh/(4e2).
Keywords
External Magnetic Field Sheet Resistance Anodic Oxidation Electron Beam Lithography Coulomb Blockade
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© Institute of Physics, Acad. Sci. CR 1996