SUPERCONDUCTION AND NORMAL CONDUCTING CHARACTERISTICS OF (YXPR1-X)BA2CU3O7-DELTA THIN-FILMS
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The ratio of Yttrium (Y) to Praseodymium (Pr) is varied in (YxPr1-x)Ba2Cu3O7-delta (YPBCO) thin films to consider the relation between superconducting YBa2Cu3O7-delta (YBCO) and insulating PrBa2Cu3O7-delta (PBCO) thin films. The critical temperature (T-c) of the superconducting YPBCO thin film is decreased by substituting more Pr in place of Y, because Pr reduces the carrier density on the CuO2 plane in YPBCO. The electrical characteristic of the YBCO film can be explained by the weakly coupled chain model. The addition of Pr reinforces the superconducting links among the grains in the YPBCO thin film. The normal state YPBCO film shows two types of transport systems. Behavior similar to impurity semiconductors appears at high temperatures and the variable range hopping mechanism governs their conductance at low temperatures.
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