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Bulk Superconductivity in La2CuO4

  • J. E. Schirber (a1), E. L. Venturini (a1), B. Morosin (a1), J. F. Kwak (a1), D. S. Ginley (a1) and R. J. Baughman (a1)...

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There is considerable interest in the interplay, of superconductivity and magnetism in La2CuO4. Several groups [1–3] have noted signs of superconductivity in nominal La2CuO4, and antiferromagnetism has been reported[4] in La2CuO4-y with y>0. The superconductivity previously reported was of a filamentary nature because although resistance drops to near zero were observed, only small Meissner effects (∼10-3 to 10-4 of perfect diamagnetism) were observed. In this paper we describe our studies of. ceramic samples of La2CuO4-y, loaded with oxygen by high pressure. This technique results in substantial incorporation of O2 in the material (of the order of 0.3 to 0.4% by weight) and in gross changes in the bulk resistivity and magnetization as well as discernable changes in the lattice parameters of the material.

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1. Belile, J., Cabanel, R., Chaillout, C., Chevalier, B., Demazeau, G., Deslandes, F., Estourneau, J., Lejoy, P., Michel, C., Provost, J., Raveau, B., Sulpico, A., Tholence, J-L., and Tournier, R., C. of Acad. Sc. Paris 304 II, 1097 (1987).
2. Grant, P. M., Parken, S. P., Lee, V. Y., Engler, E. M., Ramirez, M. L., Vazquez, J. E., Lim, G., Jacowitz, R. D., and Greene, R. L., Phys. Rev. Lett. 58, 2482 (1987).
3. Cooper, J. R., Zhou, L. W., Dunn, B., Chu, C. T., Alavi, B., and Gruner, G., to appear in Sol. State Comm.
4. Vaknin, D., Sinha, S. K., Moncton, D. E., Johnson, D. C., Newsom, J. M., Safinya, C. R., and King, H. E. Jr, Phys. Rev. Lett. 58. 2802 (1987).
5. A preliminary report on this study was presented at LT18 in August, 1987.
6. In Collaboration with J. Jorgensen, to be published.
7. Schirber, J. E., Venturini, E. L., Kwak, J. F., Ginley, D. S., and Morosin, B., J. Mat. Res. 2, 421 (1987).

Bulk Superconductivity in La2CuO4

  • J. E. Schirber (a1), E. L. Venturini (a1), B. Morosin (a1), J. F. Kwak (a1), D. S. Ginley (a1) and R. J. Baughman (a1)...

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