Enhancement of the critical current density of YBa2Cu3Ox superconductors under hydrostatic pressure.
The dependence of the critical current density Jc on hydrostatic pressure to 0.6 GPa is determined for a single 25 degrees [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 sizable concentration of vacant oxygen sites in the grain boundary region. Completely filling such sites with oxygen anions should lead to significant enhancements in Jc.
Tomita
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Department of Physics, Washington University, CB 1105, One Brookings Drive, St. Louis, Missouri 63130, USA.
Schilling
J S
JS
Chen
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Veal
B W
BW
Claus
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