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Crystal Structures and Superconductivity in the La1.5−xBa1.5+Cu7+ySystem

Published online by Cambridge University Press:  28 February 2011

JE. Greedan ,
A. H. O'Reilly ,
C. V. Stager ,
F. Razavi  and
W. Abriel
JE. Greedan
Affiliation:
Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada, L8S 4M1
A. H. O'Reilly
Affiliation:
Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada, L8S 4M1
C. V. Stager
Affiliation:
Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada, L8S 4M1
F. Razavi
Affiliation:
Physics Department, Brock University, St. Catherines, Ontario, Canada.
W. Abriel
Affiliation:
Institut fur Anorganische Chemie, Universität Hannover, 3000 Hannover 1. F.D.R.
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Abstract

Members of the solid solution system La1.5−xBa1.5+Cu7+ywith x = 0, 0.125, 0.25. 0.375 and 0.5 have been prepared both in air and under one atmosphere of flowing oxygen. In general, except for x =0, the oxygen annealed compounds are superconducting while the air-annealed samples are semiconductors. Tc's measured by Meissner effect and resistivity data range to 70K. The crystal symmetry in all cases is apparently tetragonal as verified for x = 0.375 by variable temperature Guinier x-ray experiments at temperatures down to 8K. Crystal structures have been refined from neutron powder diffraction data. A correlation is noted between Cu-0 distances which connect adjacent Cu planes - the average copper valence and the occurrence of superconductivity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 749
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

1. El-Rakho, L., Michel, C., Provost, J. and Raveau, B., J. Solid State Chem. 37, 151 (1981).Google Scholar
2. David, W.I.F., Harrison, W.T.A., Ibberson, R.M., Weiler, M.T., Grasmeder, J.R. and Lanchester, P., Nature 328, 328 (1987).Google Scholar
3. Santoro, A. et al., Mat. Res. Bull. 22, 1007 (1987);Google Scholar
Katano, S. et al., Jpn. J. Appl. Phys. 26, L1049 (1987);Google Scholar
Hewat, A.W. et al. (preprint);Google Scholar
Kamarás, K. et al., Phys. Rev. Lett. 59, 919 (1987);Google Scholar
Jorgenson, J.D. et al., Phys. Rev. B (in press).Google Scholar
Torardi, C.C. et al., S.S. Comm. (in press)Google Scholar
4. Mitzi, D.B., Marshall, A.F., Sun, J.Z., Webb, D.J., Bensley, M.R., Geballe, T.H. and Kaptiulnik, A. (preprint).Google Scholar
5. Michel, C., Deslandes, F., Provost, J., Lejay, P., Tournier, R., Hervieu, M. and Raveau, B., C.R. Acad. Sci. 304, II 1169 (1987).Google Scholar
6. Maeda, A., Yabe, T., Vchinokura, K. and Tanaka, S., Jpn. J. Appl. Phys., L1368 (1987).Google Scholar
7. Segre, C.U., Dabrowski, B., Hinks, D.G., Zhang, K., Jorgensen, T.D., Beno, M.A. and Schuller, I.K. (preprint).Google Scholar
8. Greedan, J.E., O'Reilly, A.H. and Stager, C.V., Phys. Rev. B 35, 8770 (1987).Google Scholar