Experimental results are presented for the dc and ac Josephson effects found in a bulk granular superconductor comprised of about 104 superconducting grains (less than 45 μ in dimension) packed in an insulator capsule. This new type of Josephson weakly coupled superconductor offers high sensitivity in response to microwave radiations with a noise-equivalent power as low as 10−14 W/(Hz)1/2.
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Warman et al. (1971) studied this question.
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