Series array of incommensurate superconducting quantum interference devices from YBa2Cu3O7-δ ion damage Josephson junctions

Cybart, Shane A.; Wu, S. M.; Anton, S. M.; Siddiqi, I.; Clarke, John; Dynes, R. C.
November 2008
Applied Physics Letters;11/3/2008, Vol. 93 Issue 18, p182502
Academic Journal
We have fabricated a series array of 280 superconducting quantum interference devices (SQUIDs) using YBa2Cu3O7-δ thin film ion damage Josephson junctions. The SQUID loop areas were tapered exponentially so that the response of the current-biased array to magnetic field is a single voltage spike at zero field. We fitted the current-voltage characteristics of the array to a model in which we summed the voltages across the SQUIDs assuming a resistively shunted junction model with a normal distribution of SQUID critical currents. At 75 K the standard deviation of these critical currents was 12%.


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