Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9841789 | Physica C: Superconductivity and its Applications | 2005 | 7 Pages |
Abstract
The effects of hole content (p) and oxygen deficiency (δ) on the zero-field critical current density, Jc0, were investigated for high-quality c-axis oriented Y1âxCaxBa2Cu3O7âδ (x = 0, 0.05, 0.10, and 0.20) thin films. Ca was used to introduce hole carriers in the CuO2 planes, independent of the oxygen deficiency in the CuO1âδ chains. Low-temperature Jc0 (16 K) of these films above the optimum doping were found to be high (>107 A/cm2) and were primarily determined by the hole concentration, reaching a maximum at p â¼Â 0.185 ± 0.005, irrespective of oxygen deficiency. This implies that oxygen disorder plays only a secondary role and the intrinsic Jc0 is mainly governed by the carrier concentration and consequently by the superconducting condensation energy which also peaks at p â¼Â 0.19 where the pseudogap correlation vanishes.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
S.H. Naqib, Anita Semwal,