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

  • JE. Greedan (a1), A. H. O'Reilly (a1), C. V. Stager (a1), F. Razavi (a2) and W. Abriel (a3)...

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.

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

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

  • JE. Greedan (a1), A. H. O'Reilly (a1), C. V. Stager (a1), F. Razavi (a2) and W. Abriel (a3)...

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