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(a) Design of the SQUID. (b) AFM scan of the variable-thickness bridge prepared on a thin film with a thick photoresist.
Phase shift between the voltage across the tank and the driving current measured at various temperatures as a function of the normalized external magnetic flux . From top to bottom, the data correspond to , 6.4, 7.8, 9, 10.4, and .
characteristics calculated from the phase characteristics (see Fig. 2). The curves correspond to temperatures, from top to bottom, , 6.4, 7.8, 9, 10.4, and .
Temperature dependence of the critical current of the weak link.
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