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Ac irreversibility line of bismuth-based high temperature superconductors

Published online by Cambridge University Press:  31 January 2011

A. Mehdaoui
Affiliation:
Laboratoire de Physique et de Spectroscopie Electronique, URA 1435, Faculté des Sciences, Université de Haute Alsace, 4, rue des Frères Lumière, 68093 Mulhouse Cedex, France
J. Beille
Affiliation:
Laboratoire Louis Néel, CNRS, BP 166, 38042 Grenoble Cedex 9, France
D. Berling
Affiliation:
Laboratoire de Physique et de Spectroscopie Electronique, URA 1435, Facultée des Sciences, Université de Haute Alsace, 4, rue des Frères Lumièere, 68093 Mulhouse Cedex, France
B. Loegel
Affiliation:
Laboratoire de Physique et de Spectroscopie Electronique, URA 1435, Facultée des Sciences, Université de Haute Alsace, 4, rue des Frères Lumièere, 68093 Mulhouse Cedex, France
J. G. Noudem
Affiliation:
EPM–MATFORMAG, Laboratoire d'Elaboration par Procéedée Magnétique, CNRS, BP 166, 38042 Grenoble Cedex 9, France
R. Tournier
Affiliation:
EPM–MATFORMAG, Laboratoire d'Elaboration par Procéedée Magnétique, CNRS, BP 166, 38042 Grenoble Cedex 9, France
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Abstract

We discuss the magnetic properties of lead doped Bi-2223 bulk samples obtained through combined magnetic melt texturing and hot pressing (MMTHP). The ac complex susceptibility measurements are achieved over a broad ac field range (1 Oe < hac < 100 Oe) and show highly anisotropic properties. The intergranular coupling is improved in the direction perpendicular to the applied stress and magnetic field direction, and an intragranular loss peak is observed for the first time. A comparison is made with other bismuth-based compounds and it is shown that the MMTHP process shifts the ac irreversibility line (ac IL) toward higher fields. It is also shown that all the ac IL's for quasi 2D bismuth-based compounds show a nearly quadratic temperature dependence and deviate therefore strongly from the linear behavior observed in quasi 3D compounds and expected from a critical state model.

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Articles
Copyright
Copyright © Materials Research Society 1997

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