Abstract
Ca-doped YBa2Cu3O7-δ (Ca-YBCO) thick films were grown on YBCO-seeded MgO substrates by liquid phase epitaxy (LPE) in air. The critical superconducting transition temperature (Tc) value over 90 K was achieved even with a small thickness of 0.5 µm. Using energy-dispersive X-ray spectroscopy (EDX) analyses, we detected Mg in a nondoped YBCO thick film, while it was nondetectable in a Ca-doped film. It was evident that Ca-doping into the solution for LPE growth plays a role in suppressing the Mg contamination in YBCO LPE thick films, leading to the improvement of Tc. Furthermore, the high irreversibility field (Hirr) value of up to 5 T was obtained by Ca-YBCO samples.
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