INFLUENCE OF ZN-DOPING ON THE ELECTRONIC RAMAN-SCATTERING OF YBA2CU3O7-DELTA

We present temperature dependent Raman measurements on single crystal YBa2(Cu1-xZnx)(3)O-7-delta with x = 0, 1.5%, and 3.5%. The superconduc tivity induced redistribution of the electronic background in the B-1g symmetry scattering configuration was found to disappear already for the smallest Zn concentration. In contrast, for A(1g) symmetry the red istribution is observed for all samples even though the magnitude decr eases with increasing doping. The peak position in A(1g) symmetry decr eases with increasing Zn doping and scales approximately with T-c, ind icating a superconducting gap energy of 2 Delta/k(B)T(c) approximate t o 5.0.