Hostname: page-component-6bf8c574d5-7jkgd Total loading time: 0 Render date: 2025-02-22T23:26:00.888Z Has data issue: false hasContentIssue false
  • English
  • Français

Calcium substituted Y‐Ba‐Cu‐O superconductors with enhanced Tc

Published online by Cambridge University Press:  28 February 2011

D. E. Morris ,
P. Narwankar ,
A. P. B. Sinha ,
K. Takano  and
V. T. Shum
D. E. Morris
Affiliation:
2‐300 Lawrence Berkeley Laboratory, Berkeley CA 94920
P. Narwankar
Affiliation:
2‐300 Lawrence Berkeley Laboratory, Berkeley CA 94920
A. P. B. Sinha
Affiliation:
2‐300 Lawrence Berkeley Laboratory, Berkeley CA 94920
K. Takano
Affiliation:
2‐300 Lawrence Berkeley Laboratory, Berkeley CA 94920
V. T. Shum
Affiliation:
2‐300 Lawrence Berkeley Laboratory, Berkeley CA 94920
Get access

Abstract

The Tc of 124 is enhanced by Ca substitution: CaxY(1‐x)Ba2Cu4Oy prepared at 200 bar at 930°C shows Tc = 89 K for x = 0.1. The 124 phase remains stable with Ca substitution at P(O2) ≥ 50 bar. For P(O2) = 2‐16 bar, Ca substitution stabilizes a tetragonal 123 phase CaxY(1‐x)Ba2Cu4Oy, which shows a Tc (87 K for x = 0.2) comparable to that of unsubstituted orthorhombic 123. The synthesis of CaT‐123 has been achieved in oxygen overpressure as small as 1 bar.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 237
Copyright
Copyright © Materials Research Society 1990

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Morris, D. E., et al. , Physica C 159, 287 (1989).Google Scholar
2 Morris, D. E., et al. , Physical Rev. B 39, 7347 (1989); 40, 11409 (1989)Google Scholar
3 Morris, D. E., et al. , Physical Rev. B (to be published 1 March 1990)Google Scholar
4 Morris, D. E., et al. , preprint, submitted to Physica CGoogle Scholar
5Morris Research, 1862 Euclid Avenue, #240, Berkeley, CA 94709.Google Scholar
6 Tokura, Y., et al. , Physical Rev. B38, 7156 (1988).Google Scholar
7 Torrance, J. B., et al. , Phys. Rev. Lett. 61, 1127 (1988).Google Scholar
8 Miyatake, T., et al. , Nature 341, 41 (1989).Google Scholar
9 Tokiwa, A., et al. , Jap. J. Appl Phys. 27, L1009 (1988); M. Kosuge, et al., Jap. J. Appl Phys. 27, L1022 (1988); Z. Jirak,, et al., Physica C 156, 750 (1988); M. Chandrachood et al., Appl Phys.Lett., in press.Google Scholar
10 Bormann, R. and Noelting, J., Appl Phys.Lett. 54, 2148 (1989).Google Scholar
11 Lindemer, T. B. and Sutton, A. L. Jr., , Oak Ridge National Laboratory Report ORNL/TM‐10827 (1988).Google Scholar
12 Fu, W. T. et al. , J. Less Common Metals 151, 213 (1989); Physica C 156, 133 (1988).Google Scholar