Abstract
Niobium nitride thin films have been reactively sputtered onto cylindrical quartz substrates. Films 500 Å or thicker, exhibited superconducting transition temperatures in the range 15–16 K, thinner films had lower Tc’s. Good 20-MHz SQUID behavior was noted in samples incorporating variable thickness weak links in which the ’’local’’ critical temperatures are depressed to about 12 K. Some of these SQUID’s exhibited nearly intrinsic magnetic flux noise. Correlations were obtained between the ratio of quasiparticle diffusion distance to the zero-temperature coherence length and the quality of the SQUID behavior.
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