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Nonlinear electrical conduction effects arising from local heating provide a means for detecting the presence of latent defects that are at risk of becoming open electronic circuits under stress. A special choice of ac drive current results in a dc intermodulation signal produced by nonlinear conduction, and offers several practical advantages over previous… (More)
A device capable of very sensitive temperature gradient measurements in the presence of relatively large ambient temperature fluctuations is described. The device uses a pair of ''matched'' superconducting thin films in a bridge arrangement, with a SQUID magnetometer probe as the null detector.