Abstract
The authors have investigated the effect of quenching on the intergrain critical current, Jc(inter), of YBa2Cu4O8 and Y(Ba1.6Sr0.4)Cu4O8 bulk samples. The quenching process was performed by quenching the samples from different annealing temperatures into liquid nitrogen. The critical current was deduced by AC inductive measurements. It was found that Jc(inter) was progressively lowered with increasing quenching temperature. For Sr-doped samples the suppression of the Jc(inter) by oxygen removal was more appreciable than for the undoped samples. The results suggest that weak links at grain boundaries are sensitive to quenching treatment although the grains themselves are thermally stable.
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