NORMAL RESISTIVITY AND SUPERCONDUCTIVE PROPERTIES ON YBA2(CU1-XNIX)(3)O-7-DELTA FILMS

We report the successful fabrication and characterization of YBa2(Cu,N i)(3)O-7-delta epitaxial thin films. On doping with Ni, T-c decreases and resistivity increases for YBa2(Cu1-xNix)(3)O-7-delta films. The re duction rate of T-c, dT(c)/dx, changes at x similar to 3% from similar to -5.4K/% for low Ni concentrations to -2.1K/% for higher concentrat ions. The rate of increase of resistivity, d rho(n)/dx, also changes a t the same doping content. This dependence of T-c and resistivity sugg ests a site preference change of the Ni atoms, from the CuO2 plane to the CuO chain.