SUPERCONDUCTIVITY OF PR2-XCEXCUO4-SINGLE CRYSTALS WITH NI-SUBSTITUTION AND CO-SUBSTITUTION(DELTA)

We have measured electrical resistivity and Hall-coefficient on single crystals from the electron-doped high-T-c superconductor Pr2-xCexCuO4 +delta with Cu replaced by Ni and Co partly. The impurities on the Cu- position lead to a strong increase of the residual resistivity of abou t 450 mu Omega cm/at.% substitution, T-c is suppressed at a rate of -2 0K/at.% substitution for both, Ni and Co. The Hall-coefficient R(H)(T) is strongly shifted towards positive values with increasing concentra tion of Ni and Co.