Skip to main content Accessibility help
×
Home

Composition of Superconducting La2CuO4+δ a Superconductor Doped by excess Oxygen Defects

  • B. Dabrowski (a1), D. G. Hinks (a1), J. D. Jorgensen (a1) and D. R. Richards (a1)

Abstract

We have studied mixed-phase samples of bulk LazCuO4 using neutron powder diffraction, thermogravimetric analysis and resistivity measurements. Samples fired at 950°C and slowly cooled form in the K2NiF4 structure with CuO impurities for z<2 and La2O3 impurities for z>2. Neither La-vacancies nor stacking defects were found. The bulk resistivity of the samples show semiconducting behavior which is shorted at 38K by small amounts of superconducting material. The superconductivity is due to the presence of an oxygen-rich phase with stoichiometry La2CuO4.08. The occurrence of superconductivity in pure La2CuO4.08 with the same Tc as observed in the doped La1.85 Sr0.15CuO4 indicates that the excess oxygen provides the same level of doping as metal-ion substitution.

Copyright

References

Hide All
1. Jorgensen, J. D., Dabrowski, B., Pei, Shiyou, Hinks, D. G., Soderholm, L., Morosin, B., Schiber, L.E., Venturini, E. L. and Ginley, D. S., Phys. Rev. B 38, 11337 (1988).
2. Bednorz, J. G. and Muller, K. A., Z. Phys. R 64, 198 (1986).
3. Jorgensen, J. D., Schuttler, H. B., Hinks, D. G., Capone, D. W. II, Zhang, K., Brodsky, M. B., and Scalapino, D. J., Phys. Rev. Lett. 5 1024 (1987).
4. Uchida, S., Takagi, H., Yanagisawa, H., Kishio, K., Kitazawa, K., Fueki, K., and Tanaka, S., Jpn. J. Appl. Phys. 26, L445 (1987).
5. Von Grande, B., Muller-Buschbaum, H. k. and Schweizer, M., Z. anorg. allg. Chem. 428, 120 (1977).
6. Johnston, D. C., Stokes, J. P., Goshorn, D. P. and Lewandowski, J. T., Phys. Rev. B36, 4007 (1987).
7. Vaknin, D., Sinha, S. K., Moncton, D. E., Johnston, D. C., Newsam, J. M., Safinya, C. R., and King, H. E. Jr., Phys. Rev. Lett., 58 2802 (1987).
8. Mitsuda, S., Shirane, G., Sinha, S. K., Johnston, D. C., Alvarez, M. S., Vaknin, D. and Moncton, D. E., Phys. Rev B 36, 822 (1987).
9. Grant, P. M., Parkin, S. S. P., Lee, V. Y., Engler, E. M., Ramirez, M. L., Lim, G., and Jacowitz, R. D., Phys. Rev. Lett.,58 2482 (1987).
10. Beille, J., Cabanel, R., Chaillout, C., Chevalier, B., Demazeau, G., Deslandes, F., Etourneau, J., Lejay, P., Michel, C., Provost, J., Raveau, B., Sulpice, A., Tholence, J.-L., and Tournier, R., Acad, C. R.. Sc. Paris Ser. 2 304, 1097 (1987).
11. Tarascon, J. M., Greene, L. H., Bagley, B. G., McKinnon, W. R., Barboux, P., and Hull, G. W., in Novel Superconductivity, edited by Wolf, S. A. and Kresin, V. Z. (Plenum Press, New York and London, 1987) pp. 705724.
12. Schirber, J. E., Venturini, E. L., Morosin, B., Kwak, J. F., Ginley, D. S., and Baughman, R. J., Mater. Res. Soc. Symp. Proc. Vol.99, 479 (1988).
13. Schirber, J. E., Morosin, B., Merrill, R. M., Hlava, P. F., Venturini, E. L., Kwak, J. F., Nigrey, P. J., Baughman, R. J., and Ginley, D. S., Physica C 152, 121 (1988).
14. Hinks, D. G., Dabrowski, B., Zhang, K., Segre, C.U., Jorgensen, J. D., Soderholm, L. and Beno, M. A., Mat. Res. Soc. Symp. Proc. vol.92, 9 (1988).
15. Dabrowski, B., Hinks, D. G., Jorgensen, J. D., Zhang, K. and Segre, C. U., Bull Am. Phys. Soc. 33, 557 (1988).
16. Johnston, D. C., Sinha, S. K., Jacobson, A. J. and Newsam, J. M., Physica C 153–155, 572 (1988).
17. Rogers, J. W. Jr., Shinn, N. D., Schirber, J. E., Venturini, E. L., Ginley, D.S. and Morosin, B., (in press)
18. Sinha, S. K., Mat. Res. Soc. Bulletin 13, 24 (June 1988).
19. Vanfleet, H. B., Decker, D. L., Jorgensen, J. D., Dabrowski, B., Hinks, D. G. and Richards, D. R. (unpublished data).

Composition of Superconducting La2CuO4+δ a Superconductor Doped by excess Oxygen Defects

  • B. Dabrowski (a1), D. G. Hinks (a1), J. D. Jorgensen (a1) and D. R. Richards (a1)

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