Zeitschrift für Physik B Condensed Matter

, Volume 64, Issue 2, pp 189–193 | Cite as

Possible highTc superconductivity in the Ba−La−Cu−O system

  • J. G. Bednorz
  • K. A. Müller
Article

Abstract

Metallic, oxygen-deficient compounds in the Ba−La−Cu−O system, with the composition BaxLa5−xCu5O5(3−y) have been prepared in polycrystalline form. Samples withx=1 and 0.75,y>0, annealed below 900°C under reducing conditions, consist of three phases, one of them a perovskite-like mixed-valent copper compound. Upon cooling, the samples show a linear decrease in resistivity, then an approximately logarithmic increase, interpreted as a beginning of localization. Finally an abrupt decrease by up to three orders of magnitude occurs, reminiscent of the onset of percolative superconductivity. The highest onset temperature is observed in the 30 K range. It is markedly reduced by high current densities. Thus, it results partially from the percolative nature, bute possibly also from 2D superconducting fluctuations of double perovskite layers of one of the phases present.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Tinkham, M., Beasley, M.R., Larbalestier, D.C., Clark, A.F., Finnemore, D.K.: Workshop on Problems in Superconductivity, Copper Mountain, Colorado, August 1983, p. 12Google Scholar
  2. 2.
    Beasley, M.R., Geballe, T.H.: Phys. Today36 (10), 60 (1984)Google Scholar
  3. 3.
    Müller, J.: Rep. Prog. Phys.43, 663 (1980)Google Scholar
  4. 4.
    Ott, H.R.: Unconventional Superconductivity. Zürich Phys. Soc. Seminar, Zürich, February 13, 1986Google Scholar
  5. 5.
    Johnston, D.C., Prakash, H., Zachariasen, W.H., Viswanathan, R.: Mat. Res. Bull.8, 777 (1973)Google Scholar
  6. 6.
    Baratoff, A., Binnig, G.: Physics108 B, 1335 (1981) Baratoff, A., Binnig, G., Bednorz, J.G., Gervais, F., Servoin, J.L.: In: Superconductivity ind- andf-Band Metals, Proceedings IV Conference in ‘Superconductivity ind- andf-Band Metals’. Buckel, W. and Weber, W. (eds), p. 419, Kernforschungszentrum Karlsruhe 1982Google Scholar
  7. 7.
    Binnig, G., Baratoff A., Hönig, H.E., Bednorz, J.G.: Phys. Rev. Lett.45, 1352 (1980)Google Scholar
  8. 8.
    Sleight, A.W., Gillson, J.L., Bierstedt, F.E.: Solid State Commun.17, 27 (1975) Batlogg, B.: Physica126 B, 275 (1984)Google Scholar
  9. 9.
    Thanh, T.D., Koma, A., Tanaka, S.: Appl. Phys.22, 205 (1980)Google Scholar
  10. 10.
    Mattheis, F., Hamann, D.R.: Phys. Rev. B26, 2682 (1982);ibid. 28, 4227 (1983)Google Scholar
  11. 11.
    Chakraverty, B.K.: J. Phys. Lett.40, L99 (1979); J. Phys.42, 1351 (1981)Google Scholar
  12. 12.
    Höck, K.-H., Nickisch, H., Thomas, H.: Helv. Phys. Acta56, 237 (1983)Google Scholar
  13. 13.
    Englmann, R.: In: The Jahn-Teller Effect in Molecules and Crystals. London, New York: Wiley Interscience 1972Google Scholar
  14. 14.
    Goodenough, J.B., Longo, M.: Magnetic and other properties of oxide and related compounds. In: Landolt-Boernstein New Series. Vol III/4a: Crystal and solid state physics. Hellwege, K.H., Hellwege, A.M. (eds.), p. 262, Fig. 73: Berlin, Heidelberg, New York, Springer-Verlag 1970Google Scholar
  15. 15.
    Bednorz, J.G., Müller, K.A.: (in preparation)Google Scholar
  16. 16.
    Michel, C., Raveau, B.: Chim. Min.21, 407 (1984)Google Scholar
  17. 17.
    Bednorz, J.G., Müller, K.A., Arend, H., Gränicher, H.: Mat. Res. Bull.18 (2), 181 (1983)Google Scholar
  18. 18a.
    Suzuki, M., Murakami, T., Inamura, T.: Shinku24, 67 (1981) (in Japanese)Google Scholar
  19. 18b.
    Enomoto, Y., Suzuki, M., Murakami, T., Inukai, T., Inamura, T.: Jpn. J. Appl. Phys.20, L661 (1981)Google Scholar
  20. 19.
    Müller, K.A., Pomerantz, M., Knoedler, C.M., Abraham, D.: Phys. Rev. Lett.45, 832 (1980)Google Scholar
  21. 20.
    Stocker, E., Buttat, J.: Solid State Commun.53, 915 (1985)Google Scholar
  22. 21.
    Michel, C., Er-Rakho, L., Raveau, B.: Mat. Res. Bull.20, 667 (1985)Google Scholar
  23. 22.
    Van Haesendonck, C., Bruynseraede, Y.: Phys. Rev. B33, 1684 (1986)Google Scholar
  24. 23.
    Deutscher, G., Entin-Wohlman, O., Fishman, S., Shapira, Y.: Phys. Rev. B21, 5041 (1980)Google Scholar

Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • J. G. Bednorz
    • 1
  • K. A. Müller
    • 1
  1. 1.IBM Zürich Research LaboratoryRüschlikonSwitzerland

Personalised recommendations