Normal-metal–insulator–superconductor interferometer
K. Yu. Arutyunov, T. T. Hongisto
DOI 10.1103/PhysRevB.70.064514 · Physical Review B
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Abstract
Hybrid normal-metal–insulator–superconductor microstructures were fabricated. The structures consist of a superconducting loop connected to a normal-metal electrode through a tunnel barrier. An optical interferometer with a beam splitter can be considered as a classical analog for this system. All measurements were performed at temperatures well below 1K. The interference can be observed as periodic oscillations of the tunnel current (voltage) through the junction at fixed bias voltage (current) as a function of a perpendicular magnetic field. The magnitude of the oscillations depends on the bias point. It reaches a maximum at energy eV, which is close to the superconducting gap and decreases with an increase of temperature. Surprisingly, the period of the oscillations in units of magnetic flux ΔΦ is equal neither to h∕e nor to h∕2e, but significantly exceeds these values for larger loop circumferences. Possible explanations of the phenomena are discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.35 | Pressure not reported | unknown |
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