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Suppression of the critical current of a balanced superconducting quantum interference device
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Balanced SQUID. The middle junction is larger than the others. (b) Large detector junction in parallel with the balanced SQUID. (c) Scanning electron micrograph of the sample showing the on-chip coils and the narrow SQUID loops, and a simplified sketch of the measurement setup. Here, the resistance in series with the pump is . (d) Magnified view of the junctions and a sketch of the SQUID loops.

Image of FIG. 2.
FIG. 2.

(a) Measured critical current of the balanced SQUID as a function of the coil currents. The maximum is shifted from zero current due to an offset flux. (b) Respective theoretical flux modulation of the critical current calculated with the parameters fitted from the measurement.

Image of FIG. 3.
FIG. 3.

Detector flux modulations near the minimum of . The horizontal lines present change from as a percentage of the maximum of . The open circles are an example of the data used for the parameter fits of the cross coupling terms and . The black line is the corresponding curve of the zero-inductance model yielding a critical current . The data spanning four flux quanta presented by the red squares and the blue circles were not used for fitting. The corresponding red and blue lines are the predicted flux modulations yielding and , respectively. The inset shows typical results of similar critical current measurements of two ordinary dc SQUIDs, expressed as a function of the applied magnetic flux of the SQUID. The minima of the critical currents are 2.5% and 4.6% of the maxima, which are about for both SQUIDs.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Suppression of the critical current of a balanced superconducting quantum interference device