Volume 68, Number 1, October 2004
|Page(s)||86 - 92|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2004|
Half- critical current —Oscillations of SQUIDs
Experimentalphysik VI, Center for Electronic Correlations and Magnetism Institute of Physics, Augsburg University - D-86135 Augsburg, Germany
2 IBM Thomas J. Watson Research Center - P.O. Box 218 Yorktown Heights, NY 10598, USA
3 Department of Physics, University of Florida - Gainesville, FL 32611, USA
Accepted: 29 July 2004
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 /2e. Here we report on the fabrication and properties of SQUIDs modulating with a fundamental period of . The characteristics of these bicrystal SQUIDs are consistent with either a strong sin(2φ) 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: 74.20.Rp – Pairing symmetries (other than s-wave) / 85.25.Dq – Superconducting quantum interference devices (SQUIDs) / 85.25.Cp – Josephson devices
© EDP Sciences, 2004
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