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

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6 Author(s)
Cybart, S.A. ; Department of Physics, University of California, Berkeley, California 94720-7300, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA ; Wu, S.M. ; Anton, S.M. ; Siddiqi, I.
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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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Applied Physics Letters  (Volume:93 ,  Issue: 18 )