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Publication Citation: Effect of a Compressive Uniaxial Strain on the Critical Current Density of Grain Boundary in Superconducting YBa2Cu3O7-δ Films

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Author(s): Daniel C. van der Laan; Timothy J. Haugan; Paul N. Barnes;
Title: Effect of a Compressive Uniaxial Strain on the Critical Current Density of Grain Boundary in Superconducting YBa2Cu3O7-δ Films
Published: July 10, 2009
Abstract: Grain boundaries can be a significant barrier for current flow in high temperature superconducting (HTS) thin films. We show that an applied compressive strain causes a remarkable increase in critical current density (Jc,GB) in thin film YBa2Cu3O7-δ (YBCO) grain boundaries. The data presented here clearly show that the strain dependence of Jc,GB is somewhat surprisingly identical to that of the intragrain critical current density (Jc), contrary to present understanding. A relatively straightforward model is shown to describe and predict how strain affects the current transfer in grain boundaries, where it provides an estimate of the lattice strain at the grain boundary.
Citation: Physical Review Letters
Volume: 103
Pages: 4 pp.
Keywords: superconductivity;grain boundaries;strain;critical current density;thin films
Research Areas: Energy Conversion, Storage, and Transport, Properties, Ceramics
PDF version: PDF Document Click here to retrieve PDF version of paper (415KB)