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Considerably improved flux pinning and critical current density Jc values have been achieved in Y-deficient Y-123 superconductors by directional solidification in air. In comparison with the regular Y-123 composition, Y-deficient one also has an orthorhombic structure and Y-123 main crystal phase remains in it. Whereas with the shortage of Y, Y1−xBa2Cu3O7−y can be regarded as (YBa2Cu3)1−xO7−t(Ba...
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