Abstract
Abstract From the behaviour of a small specimen of low density YBaCuO as a bulk RF SQUID at 77 K, we infer that it represents a network of superconducting loops of diameter 2–20 μm, interrupted by Josephson junctions of critical current 1–10 μA. The SQUID loops operate in the non-hysteretic mode, with Josephson inductances, L j , greater than the loop inductances, L s . For fields exceeding about 0.01 mT, flux enters the entire specimen and leads to enhanced SQUID response. We show that this behaviour is consistent with Clem's intergranular junction model. In high density specimens direct SQUID response is not observable but a harmonic technique shows that the junctions continue to play an important role as weak flux trapping elements and also as highly non-linear mixing components. The 1/cos φ phase dependence of L j is particularly important at high current density.
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