| Issue |
Europhys. Lett.
Volume 68, Number 1, October 2004
|
|
|---|---|---|
| Page(s) | 86 - 92 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2004-10165-x | |
| Published online | 01 September 2004 | |
Half-
critical current —Oscillations of
SQUIDs
1
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
Received:
3
May
2004
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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