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Flux pinning and critical currents in superconducting thallium cuprates

โœ Scribed by M.R. Presland; J.L. Tallon; N.E. Flower; R.G. Buckley; A. Mawdsley; M.P. Staines; M.G. Fee

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

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โœฆ Synopsis

The irreversibility lines Hirr(T) for the series of superconducting compounds mlrnA2Can_lCunO2+m+2n, where A is Ba or Sr, are measured between 0 and 1 T for m = 1 and 2 and n = 1, 2, 3 and 4 and show a marked steepening with decreasing anisotropy, i.e. as m is lowered from 2 to 1. In addition, for m = 2 material H~rr(T) is observed to steepen with decreasing number of CuO2 layers. The hole dependence of the irreversibility line is also investigated in TI2Ba2CuO6+ ~ by changing the oxygen stoichiometry 6. Hirr(T) progressively steepens with increasing hole concentration on the overdoped side of To(max). These results are consistent with a model of flux motion arising from a cross-over from 3D vortex lines to 2D pancake vortices which are decoupled in the c-direction, and provide guidance for materials selection and optimum doping. The manufacture of superconducting, silver-clad tapes using TIo.sPbo.sSr2Cao.8Yo.2Cu207 is described. Zero field transport critical currents in excess of 104 A cm-2 are obtained but the material is untextured and weak-linked, as shown by the strong field dependence of dc'

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