Possible highT c superconductivity in the Ba−La−Cu−O system

Abstract

Metallic, oxygen-deficient compounds in the Ba−La−Cu−O system, with the composition Ba x La5−x Cu5O5(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.

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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. 12

  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, 1986

  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 1982

    Google 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 1972

    Google 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 1970

    Google Scholar 

  15. 15.

    Bednorz, J.G., Müller, K.A.: (in preparation)

  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 

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Bednorz, J.G., Müller, K.A. Possible highT c superconductivity in the Ba−La−Cu−O system. Z. Physik B - Condensed Matter 64, 189–193 (1986). https://doi.org/10.1007/BF01303701

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Keywords

  • Neural Network
  • Perovskite
  • Nonlinear Dynamics
  • Onset Temperature
  • High Current Density