Observation of large $h/2e$ and $h/4e$ oscillations in a proximity dc superconducting quantum interference device

Abstract

We have measured the magnetoresistance of a dc superconducting quantum interference device in the form of an interrupted mesoscopic normal-metal loop in contact with two superconducting electrodes. Below the transition temperature of the superconducting electrodes, large $h/2e$ periodic magnetoresistance oscillations are observed. By adding a small dc bias to the ac measurement current, $h/4e$ oscillations can be produced. Lowering the temperature further leads to even larger oscillations, and eventually to sharp switching from the superconducting state to the normal state. This flux-dependent resistance could be utilized to make highly sensitive flux detector.

One pdf file, 4 pages, 4 figure. For figure 1, a smaller file is uploaded

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Cited by in corpus (6)

• Little-Parks effect in single YBaCuO sub-micron rings
• Fast thermometry with a proximity Josephson junction
• Gate-tunable superconducting quantum interference devices of PbS nanowires
• Higher harmonic resistance oscillations in micro-bridge superconducting Nb ring
• Thermal fluctuations and flux-tunable barrier in proximity Josephson junctions
• Observation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device