Abstract
SQUID susceptibility measurements of the high T c superconductor Sr 0.2La 1.8CuO 4, with a 40 K resistive onset, are reported for fields from 1 μT to 4.5 T (10mG to 45 kG). Data show an average lower critical field of 30 mT at 5 K, but with nonlinearities appearing as low as 100 μT. Zero field cooling and subsequent application of a field shows a diamagnetic shielding effect reaching 100% in the lowest fields with a 37 K onset and 31 K midpoint. The observed Meissner effect in single phase material exceeds 40% but decreases with oxygen annealing even though T c increases.
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