TITLE

Enhancing Tc in Bi2.1CaSr2Cu2O8+δ from 90 to 101 K by yttrium substitution

AUTHOR(S)
Tallon, J. L.; Buckley, R. G.; Staines, M. P.; Presland, M. R.; Gilberd, P. W.
PUB. DATE
April 1989
SOURCE
Applied Physics Letters;4/17/1989, Vol. 54 Issue 16, p1591
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The Y and rare-earth substitution for Ca in Bi2.1CaSr2Cu2O8+δ is described with particular emphasis on Y substitution. We have prepared single phase, fully substituted material which exhibits an 8.0×b-axis incommensurate structure, rather larger than the 4.75× structure in the parent superconductor. The infrared absorption spectra of the insulating fully substituted material are shown to have features very similar to that for YBa2Cu3O7-δ. A solubility range is observed only at substitutions up to 5% at which point zero-resistance Tc is raised from 90 to 101 K. This is shown to arise from 2 copper-layer material and not from 3 copper-layer material. Combined Y and Pb substitution yields n=2 material for which Tc remains fixed at 90 K, insensitive to annealing temperature and oxygen loading.
ACCESSION #
9830829

 

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