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


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


Neural Network Perovskite Nonlinear Dynamics Onset Temperature High Current Density 
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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

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

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