Abstract
We have used a conventional low noise dc SQUID to measure the magnetic noise in bulk YBCO ring and a thick film YBCO tube over the temperature range 4–100K and in very low magnetic fields. We observe noise levels which are higher than those found by other workers using epitaxial thin films. The noise in the bulk sample close to the transition exhibits two very closely spaced peaks and a spectral density which differs substantially from 1/f n. By cutting a thin slit in the sample, we have identified one of the peaks with the onset of connectivity around the sample.
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