Resistive SQUIDs, here called RSOUIDS, may be thought of as SQUIDs in which some of the superconducting material has been replaced by normal metal (Fig. 1). Magnetic flux ∅m varying with time, produced by current im in a coil inductively coupled to the RSQUID by mutual inductance M, will cause the output voltage vo to oscillate just as it would for a SQUID, but only if im varies sufficiently rapidly. The voltage vo may be caused to oscillate in another way: if an external current I is passed through the normal metal region N (Fig. lb) vo will oscillate at a frequency f = IR/∅o, where R is the resistance of N.
KeywordsWeak Link Normal Metal Heat Current External Current Phase Sensitive Detector
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