EXAFS analyses of YBCO doped with Pr approve that the O position in this system changes with the Pr concentration x. With increasing x, the deformation of CuO2 plane greater, the O in the Cu-O chain nearer CuO2 plane, the distance between Ba and O3 longer. All these tructure changes in the Y1-xPrxBa2Cu3O7-δ system make the carrier density decreas and make the carrier strongly localize, which causes the change of superconductivity.
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