Abstract
Transport measurements were made on c-axis orientated thin films of YBa 2Cu 3O 7 − x in order to obtain the magnetic field and the temperature dependence of the in-plane critical current density J c ab. By rotating the samples in the external field, the anisotropy of flux pinning was assessed for this material. Sets of J c( θ, T, B) curves, obtained for a variety of differently produced samples, allow us to distinguish between intrinsic pinning properties due to the crystal structure and the nature of the superconducting state, which influences the shape of the flux lines, and pinning by defects. A gradual cross-over from a quasi two-dimensional superconducting state at low temperatures to a three-dimensional state at high temperatures is suggested. We analyse the influence of this effect on the temperature, field and angular dependence of J c ab.
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