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Enhancement of the Critical Current Density of YBa2Cu3Ox Superconductors under Hydrostatic Pressure

T. Tomita·J. S. Schilling·L. Chen·B. W. Veal·H. Claus
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Abstract

The dependence of the critical current density Jc on hydrostatic pressure to 0.6 GPa is determined for a single 25-degree [001]-tilt grain boundary in a bicrystalline ring of nearly optimally doped melt-textured YBa2Cu3Ox. Jc is found to increase rapidly under pressure at +20 %/GPa. A new diagnostic method is introduced (pressure-induced Jc relaxation) which reveals a sizeable concentration of vacant oxygen sites in the grain boundary region. Completely filling such sites with oxygen anions should lead to significant enhancements in Jc.

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T. Tomita, J. S. Schilling, L. Chen, B. W. Veal, H. Claus. 2005-11-17. Enhancement of the Critical Current Density of YBa2Cu3Ox Superconductors under Hydrostatic Pressure. https://doi.org/10.1103/physrevlett.96.077001

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