Abstract
Samples of superconducting tapes with two type cores (YBa2Cu3O7−y and Y0.7Ca0.3Ba2Cu3O7−δ), obtained by the OPIT method under two different regime of rolling—cold (20 °C) and hot (825 °C) are investigated. The superconducting core materials were prepared by standard solid-state technology and fill in the high purity (4N) Ag-tubes. The effect of cold and hot rolling deformation on the orientation of supercoducting crystals were studied by XRD analysis. It was found that a higher degree of texturing in the out of plane direction is obtained after hot rolling deformation in tapes with overdoped core. As a result, the highest critical current density (Jc) at 77 K and zero magnetic field was achieved in them. Jc increases with the time in the superconducting tapes, which is connected probably with the releasing of stress between the superconducting core and Ag sheat.
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