Skip to main content Accessibility help
×
Home

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

  • D. E. Morris (a1), P. Narwankar (a1), A. P. B. Sinha (a1), K. Takano (a1) and V. T. Shum (a1)...

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.

Copyright

References

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

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed