Scaling properties of the anisotropic critical current density in bulk textured YBaCuO. Evidence toward a 3D flux line lattice |
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Authors: | D Braithwaite D Bourgault A Sulpice J M Barbut R Tournier I Monot M Lepropre J Provost G Desgardin |
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Affiliation: | (1) Centre National de la Recherche Scientifique, Centre de Recherches sur les Très Basses Tempèratures, BP 166, 38042 Grenoble Cédex, France;(2) Laboratoire associé à l' Université Joseph Fourier, 38042 Grenoble, France;(3) Present address: Merlin Gérin, Centre de Recherches A2, 38050 Grenoble Cedex, France;(4) CRISMAT/ISMRA, 14050 Caen Cédex, France |
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Abstract: | We have measured dc transport critical current densities of melt texture grown and magnetically melt textured bulk YBaCuO
at 77 K and in magnetic field. A maximum value of over 31,000 A/cm2 is obtained with a field of 7 teslas applied parallel to the (a, b) planes. Over the rest of the angular range the critical current is shown to be determined mainly by thec-axis component of the applied field. Although this dependency is expected in the presence of two-dimensional vortices, in
fact the data are shown to correspond better to the behavior expected of an anisotropic three-dimensional superconductor.
These results are compared to magnetization measurements on the same samples. We show that when the field is directed close
to the c-axis, superconducting transport currents flow at fields well above the field at which the irreversible magnetization
disappears. |
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