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Properties of High Tc Short Coherence Length Superconductors

  • Guy Deutscher
Conference paper

Abstract

Two fundamental consequences of the very short coherence length of the new high Tc superconducting oxides are discussed. The first one is an enhanced sensitivity to crystallographic defects which results in local depressions of the superconducting order parameter and weak link behavior. This effect becomes very pronounced when the coherence length approaches the lattice parameter, and results in much reduced critical current densities accross boundaries perpendicular to the c axis. The second consequence are enhanced critical fluctuations of the order parameter in the small coherence volume. We show that there exists a direct relationship between the width of the critical region and the weak pinning often observed in the high Tc oxides.Both of the effects that we discuss -local depressions of the order parameter at boundaries and enhanced critical fluctuations -contribute to a reduction of the critical current density, flux motion and glass behavior.

Keywords

Critical Current Density Coherence Length Critical Field Condensation Energy Local Depression 
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 Japan 1989

Authors and Affiliations

  • Guy Deutscher
    • 1
  1. 1.School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact SciencesTel Aviv UniversityRamat Aviv, Tel AvivIsrael

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