Abstract

Abstract The fabrication and physical properties of DC SQUIDs using Bi(Pb)SrCaCuO thin films are reported. The total Josephson critical current of DC SQUIDs with different microbridge widths (0.5–12μm) ranges from 8 μA to 5 mA. The observed quantum interference pattern under an applied magnetic filed is largely deformed and a discussion based on the multiple interference effect is given. The measured voltage modulation depth is found to be smaller than the calculated value. The Josephson critical current exhibits a (1− T / T rmc ) n dependence on temperature where n =1−2.5.

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