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Superconductivity and Stoichiometry in Tl2Ca2Ba2Cu3Ox Single Crystals

Published online by Cambridge University Press:  28 February 2011

E. L. Venturini ,
C. P. Tigges ,
R. J. Baughman ,
D. S. Ginley  and
B. Morosin
E. L. Venturini
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185–5800
C. P. Tigges
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185–5800
R. J. Baughman
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185–5800
D. S. Ginley
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185–5800
B. Morosin
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185–5800
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Abstract

Magnetization and resistivity data are presented which show a substantial difference in superconducting transitions for nominal Tl2Ca2Ba2Cu3Ox plates with identical crystal structures grown from two different “melt” compositions. A Tl-O and CuO-rich flux yielded approximately stoichiometric plates which have sharp transitions beginning near 111 K, while a second Tl-O-rich flux produced plates containing more Tl and less Ba with very broad transitions starting near 96 K. These data demonstrate the extreme sensitivity of superconductivity to cation site disorder in the Tl-Ca-Ba-Cu-O system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 1069
Copyright
Copyright © Materials Research Society 1990

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