Abstract
Transport and a.c. susceptibility data on a crystalline sample of Y 1Ba 2Cu 3O 7− x in fields up to 9 T along the c-axis are presented. Careful study of the I–V curves and the frequency dependent a.c. susceptibility indicate that the critical current develops suddenly at a line in the H–T phase diagram that coincides with the irreversibility line as measured by a.c. susceptibility. Above this line, which is interpreted as the melting of a pinned vortex regime, the I–V curves are linear and the resistance has a flux flow like character. However, the R versus T behaviour in the melted region supports the interpretation of two different regions of flux flow viscosity.
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