Abstract
A texturizing method for ceramic superconductors involving a new way for rapid melting and quenching in a solar furnace is presented. The method involves rapid melting of a silver-doped YBCO rod suspended in an evacuated quartz tube at a temperature exceeding 2000°C followed by rapid quench on a silver mould. The sample obtained is melt-textured in a tube furnace. The melt-textured product exhibits high critical current density of the order of 104 A/cm2 in the field of 1 T at 50 K. This property is discussed in the framework of pinning centers introduced in our materials during the rapid melting and quenching process. Nonsuperconducting phases created during the quenching process serve as these pinning centers.
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