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(a) Modulation of the critical current in a standard low inductance dc SQUID (the TJE). (b) Modulation of the critical current in an O-TJE, where the two distinct optimal points are indicated.
(a) Schematic of the O-TJE described in this paper. (b) Microphotograph of the tested device.
Contour plots of the critical current vs. the flux current controls and (solid lines were obtained experimentally, dashed lines are a fit). The contours correspond to critical current values of , 50, 40, 30, and , respectively (from peaks to valleys).
Modulation of the critical current vs the current for a fixed .
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