Finite-bias resistance peaks in nanoscale superconductor–normal-metal Ta-W point contacts
P. S. Westbrook, A. Javan
DOI 10.1103/PhysRevB.59.14606 · Physical Review B
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Abstract
High resistance (10–1000 Ω) ballistic nanoconstrictions were formed between bulk superconducting tantalum and an electrochemically sharpened (10–200 nm radius at tip) tungsten whisker. Measurements of the dynamic resistance of these contacts showed resistance peaks at symmetric voltages sizeably larger than the superconducting gap (|V|>10Δ). The voltage at which these peaks occur was found to be linear in the square root of the measured contact resistance, strongly supporting a model in which the resistance peaks result from the destruction of superconductivity by the magnetic field produced by current flow through the contact. The model is in quantitative agreement with observation and implies that each resistance peak corresponds to the appearance of a single flux quantum around the current flowing through the contact.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ta Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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