Abstract
Y 0.4Pr 0.6Ba 2−xSr xCu 3O 7-δ (x=0, 1.0) samples were studied by X-ray Rietveld analysis. It was found that the average Pr O bond length increases from 2.435Å at x=0 to 2.457Åat x=1.0, the Cu(2) O Cu(2) angles within the CuO 2 planes become larger, and there is no significant mutual substitution between Pr and Sr ions. Our work supports that Pr O covalent mixing effect is responsible for the superconductivity suppression by Pr.
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