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Scanning Tunneling and Atomic Force Microscope Studies of Thin Sputtered Films of YBa2Cu3O7

  • Ian D. Raistrick
  • Marilyn Hawley

Abstract

Although the fundamental attributes of superconductors (e g., T c , coherence length, penetration depth) are determined by the atomic and electronic structure of the material, many practically important properties, including critical current density and high-frequency conductivity, are dominated by the interaction between these properties and the microstructure. This is particularly true for the high-temperature superconducting (HTS) cuprates, because their coherence length, which is the scale over which the Ginzberg-Landau order parameter can vary, may be as short as a few Angstroms in some directions. Thus, perturbations of the structure associated with point defects, dislocations, grain boundaries, twins, etc., can lead to spatial fluctuations in the superconducting properties, with profound implications for magnetic flux entry and motion, intergrain coupling energy, etc. Additionally, these materials have layered structures, which lend an almost two-dimensional character to the superconductivity, and intergranular misorientations are expected to be very significant.

Keywords

Screw Dislocation Scanning Tunneling Step Edge Flux Line Growth Unit 
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-Verlag New York, Inc. 1994

Authors and Affiliations

  • Ian D. Raistrick
    • 1
  • Marilyn Hawley
    • 1
  1. 1.Los Alamos National LaboratoryLos AlamosUSA

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