Possible High Tc Superconductivity in the Ba — La — Cu — O System

  • J. G. Bednorz
  • K. A. Müller
Part of the Perspectives in Condensed Matter Physics book series (PCMP, volume 7)


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 with x = 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.


Logarithmic Increase Polaron Formation High Superconducting Transition Temperature High Onset Temperature Percolative Nature 
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  1. 1.
    Tinkham, M., Beasley, M.R., Larbalestier, D.C., Clark, A.F Finnemore, D.K.: Workshop on Problems in Superconducti ity, Copper Mountain, Colorado, August 1983, p. 12Google Scholar
  2. 2.
    Beasley, M.R., Geballe, T.H.: Phys. Today36(10), 60 (1984)CrossRefGoogle Scholar
  3. 3.
    Müller, J.: Rep. Prog. Phys.43,663 (1980)CrossRefGoogle Scholar
  4. 4.
    Ott, H.R.: Unconventional Superconductivity. Zürich Phy Soc. Seminar, Zürich, February 13, 1986Google Scholar
  5. 5.
    Johnston, D.C., Prakash, H., Zachariasen, W.H., Viswanatha R.: Mat. Res. Bull.8,777 (1973)CrossRefGoogle Scholar
  6. 6.
    Baratoff, A., Binnig, G.: Physics108 B.1335 (1981) Baratoff, A., Binnig, G., Bednorz, J.G., Gervais, F., Servoi J.L.: In: Superconductivity ind-and f-Band Metals, Proceei ings IV Conference in Superconductivity ind-and f-Band Me als’. Buckel, W. and Weber, W. (eds), p. 419, Kernforschung zentrum Karlsruhe 1982Google Scholar
  7. 7.
    Binnig, G., Baratoff A., Hönig, H.E., Bednorz, J.G.: Phys. Re Lett.45,1352 (1980)ADSCrossRefGoogle Scholar
  8. 8.
    Sleight, A.W., Gillson, J.L., Bierstedt, F.E.: Solid State Con mun.17,27 (1975)ADSCrossRefGoogle Scholar
  9. Batlogg, B.: Physica126 B,275 (1984)Google Scholar
  10. 9.
    Thanh, T.D., Koma, A., Tanaka, S.: Appl. Phys.22,205 (1980)ADSCrossRefGoogle Scholar
  11. 10.
    Mattheis, F., Hamann, D.R.: Phys. Rev. B 26,2682 (1982ibid.28,4227 (1983)Google Scholar
  12. 11.
    Chakraverty, B.K.: J. Phys. Lett.40,L99 (1979); J. Phys.4; 1351 (1981)Google Scholar
  13. 12.
    Höck, K.-H., Nickisch, H., Thomas, H.: HeIv. Phys. Acta5237 (1983)Google Scholar
  14. 13.
    Englmann R.In: The Jahn-Teller Effect in Molecules an Crystals. London, New York: Wiley Interscience 1972Google Scholar
  15. 14.
    Goodenough, J.B., Longo, M.: Magnetic and other propertic of oxide and related compounds. In: Landolt-Boernstein Nei Series. Vol III/4a: Crystal and solid state physics. Hellwege, K.H., Hellwege, A.M. (eds.), p. 262, Figure. 73. Berlin, Heidelberg, New York: Springer-Verlag 1970.Google Scholar
  16. 15.
    Bednorz, J.G., Müller, K.A.: (in preparation)Google Scholar
  17. 16.
    Michel, C., Raveau, B.: Chim. Min. 21, 407 (1984)Google Scholar
  18. 17.
    Bednorz, J.G., Müller, K.A., Arend, H., Gränicher, H.: Mat. Res. Bull.18 (2), 181 (1983)CrossRefGoogle Scholar
  19. 18.
    Suzuki, M., Murakami, T., Inamura, T.: Shinku 24, 67 (1981) (in Japanese)CrossRefGoogle Scholar
  20. Enomoto, Y., Suzuki, M., Murakami, T., Inukai, T., Inamura, T.: Jpn. J. Appl. Phys.20,L661 (1981)ADSCrossRefGoogle Scholar
  21. 19.
    Müller, K.A., Pomerantz, M., Knoedler, C.M., Abraham, D.: Phys. Rev. Lett. 45, 832 (1980)ADSCrossRefGoogle Scholar
  22. 20.
    Stocker, E., Buttat, J.: Solid State Commun. 53, 915 (1985) 193Google Scholar
  23. 21.
    Michel, C., Er-Rakho, L., Raveau, B.: Mat. Res. Bull.20,667 (1985)CrossRefGoogle Scholar
  24. 22.
    Van Haesendonck, C., Bruynseraede, Y.: Phys. Rev. B 33, 1684 (1986)ADSCrossRefGoogle Scholar
  25. 23.
    Deutscher, G., Entin-Wohlman, O., Fishman. S., Shapira, Y.: Phys. Rev. B 21, 5041 (1980)ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1986

Authors and Affiliations

  • J. G. Bednorz
    • 1
  • K. A. Müller
    • 1
  1. 1.IBMZürich Research LaboratoryRüschlikonSwitzerland

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