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Hole Concentration and Tc in the TI2-x-zBa2+xCa2+xCu3O10-y System

Published online by Cambridge University Press:  26 February 2011

M. Paranthaman ,
M. Foldeaki ,
A. NaziriPour  and
A. M. Hermann
M. Paranthaman
Affiliation:
Department of Physics, Campus Box 390, University of Colorado, Boulder, CO 80309
M. Foldeaki
Affiliation:
National Institute of Standards and Technology, Boulder, CO 80303
A. NaziriPour
Affiliation:
Department of Physics, Campus Box 390, University of Colorado, Boulder, CO 80309
A. M. Hermann
Affiliation:
Department of Physics, Campus Box 390, University of Colorado, Boulder, CO 80309
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Abstract

Single phase Tl-2223 samples were prepared in the TI2-x-zBa2Ca2+xCu3O10-y (z represent Tl vacancies in the range 0.22 – 0.27 and y represent oxygen vacancies in the range 0.17 – 0.33) system with x between 0 and 0.4. A small impurity phase was found at x = 0.6. All samples were found to be tetragonal. The Tc varied between 112 and 118 K for the “as-synthesized” samples. After post-annealing in a sealed quartz tube under vacuum at 750*deg;C for 10 days, the Tc increased from 116 to 122 K for x = 0.3 and from 118 to 120 K for x = 0,4 samples. Although x = 0.3 sample had small impurity phases after post-annealing, a large amount of impurity phases were found for x = 0.4 sample after post-annealing. Wet chemical analysis showed that all samples were both Tl and oxygen deficient. The Tc was found to increase with increasing hole concentration. The origin of the holes for all these samples is due to Ca2+ substitution on the TI3+ sites and overlap of Tl-6s band with the conduction band of the CuO2 sheets.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 41
Copyright
Copyright © Materials Research Society 1992

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References

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