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We have performed systematic resistivity and inelastic neutron scatteringmeasurements on Fe$_{0.98-z}$Ni$_z$Te$_{0.5}$Se$_{0.5}$ samples to study theimpact of Ni substitution on the transport properties and the low-energy ($\le$12 meV) magnetic excitations. It is found that, with increasing Ni doping, boththe conductivity and superconductivity are gradually suppressed; in contrast,the low-energy magnetic spectral weight changes little. Comparing with theimpact of Co and Cu substitution, we find that the effects on conductivity andsuperconductivity for the same degree of substitution grow systematically asthe atomic number of the substituent deviates from that of Fe. The impact ofthe substituents as scattering centers appears to be greater than anycontribution to carrier concentration. The fact that low-energy magneticspectral weight is not reduced by increased electron scattering indicates thatthe existence of antiferromagnetic correlations does not depend on electronicstates close to the Fermi energy.

physical review. b, condensed matter and materials physics

Substitution of Ni for Fe in superconducting  Fe$_{0.98}$Te$_{0.5}$Se$_{0.5}$ depresses the normal-state conductivity but  not the magnetic spectral weight