EFFECT OF PR SCATTERING ON THE PENETRATION DEPTH LAMBDA(AB) IN BI2SR2CA1-XPRXCU2O8-CRYSTALS(DELTA SINGLE)

Four superconducting single crystals near the optimum-doped region (x= 0, 0.11, 0.17, and 0.28) for the Bi2Sr2Ca1-xPrxCu2O8+delta system were chosen for detailed structural and magnetic measurements, in order to study the effect of Pr scattering on the temperature dependence of th e ab-plane penetration depth alpha(ab). The penetration depth for thes e incommensurate modulated single crystals follows a T-2 behavior at l aw temperature, and then crossover to a Linear T dependence at the cha racteristic temperature T. Variation of linear T region and T* with i ncreasing Pr content indicates that Pr acts as a strong scattering cen ter that modifies the local density of stares of the system. The prese nt result is consistent with the prediction for disorder-affected d-wa ve superconductors. [S0163-1829(98)01326-5].