Abstract
We were able to vary the oxygen concentration of a YBCO coated-conductor sample from the under-doped to the over-doped regime. This was achieved by secondary oxygenation treatments at temperatures between 250 °C and 500 °C employing a novel oxygenation scheme. The YBCO-coated conductor was fabricated by the inclined substrate deposition method. Superconducting transition temperature and critical current as function of temperature and magnetic field were determined by a contact-free magnetization technique on a ring sample. It is observed that for temperatures at and below 77 K, the maximum critical current is obtained in the most over-doped state where the transition temperature is significantly depressed.
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