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Anisotropic pinning and dimensionality effects in YBa2Cu3O7-x thin films

✍ Scribed by R.M. Schalk; G. Samadi Hosseinali; H.W. Weber; Z.H. Barber; P. Przyslupski; J.E. Evetts; A. Pönninger; P. Schwab; S. Proyer; A. Kochemasov; D. Bäuerle

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
480 KB
Volume
33
Category
Article
ISSN
0011-2275

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✦ Synopsis

Transport measurements were made on c-axis orientated thin films of YBa2Cu307 x in order to obtain the magnetic field and the temperature dependence of the in-plane critical current density jab. By rotating the samples in the external field, the anisotropy of flux pinning was assessed for this material. Sets of Jc(0, 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 threedimensional state at high temperatures is suggested. We analyse the influence of this effect on the temperature, field and angular dependence of j~b.

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