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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)

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 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.

Keywords

Logarithmic Increase Polaron Formation High Superconducting Transition Temperature High Onset Temperature Percolative Nature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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