Half-h/2e critical current—Oscillations of SQUIDs

Half-h/2e critical current—Oscillations of SQUIDs

The current-voltage characteristics of Superconducting Quantum Interference Devices (SQUIDs) are known to modulate as a function of applied magnetic field with a period of one flux quantum Phi0 = h/2e. Here we report on the fabrication and properties of SQUIDs modulating with a fundamental period of...

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Veröffentlicht in:Europhysics letters 2004-10, Vol.68 (1), p.86-92
Hauptverfasser: Schneider, C. W, Hammerl, G, Logvenov, G, Kopp, T, Kirtley, J. R, Hirschfeld, P. J, Mannhart, J
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container_end_page 92
container_issue 1
container_start_page 86
container_title Europhysics letters
container_volume 68
creator Schneider, C. W
Hammerl, G
Logvenov, G
Kopp, T
Kirtley, J. R
Hirschfeld, P. J
Mannhart, J
description The current-voltage characteristics of Superconducting Quantum Interference Devices (SQUIDs) are known to modulate as a function of applied magnetic field with a period of one flux quantum Phi0 = h/2e. Here we report on the fabrication and properties of SQUIDs modulating with a fundamental period of 1/2XPhi0. The characteristics of these bicrystal SQUIDs are consistent with either a strong sin(2) component of the current-phase relation of the Josephson current, or with an interaction between the Cooper pairs, causing an admixture of quartets to the condensate.
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