C. W. Schneider et al 2004 Europhys. Lett. 68 86 doi:10.1209/epl/i2004-10165-x
Half-h/2e critical current—Oscillations of SQUIDs
C. W. Schneider1, G. Hammerl1, G. Logvenov1, T. Kopp1, J. R. Kirtley2, P. J. Hirschfeld3 and J. Mannhart1
Show affiliationsThe 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 Φ0 = h/2e. Here we report on the fabrication and properties of SQUIDs modulating with a fundamental period of 1/2×Φ0. 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.
- PACS
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
- Subjects
- Dates
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Issue 1 (October 2004)
Received 3 May 2004, accepted for publication 29 July 2004
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Half-h/2e critical current—Oscillations of SQUIDs
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