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We report the effect of Ni doping on superconductivity of FeSe0.5Te0.5. Thesingle crystal samples of series Fe1-xNixSe0.5Te0.5 (x=0.0, 0.01, 0.03, 0.05,0.07, 0.10 and 0.20) are synthesized via vacuum shield solid state reactionroute and high temperature heating followed by slow cooling. All the crystalsof Fe1-xNixSe0.5Te0.5 series with x up to 0.20, i.e., 20% substitution of Ni atFe site are crystallized in single phase tetragonal structure with space groupP4/nmm. The electrical resistivity measurements revealed that Tc decreases fastwith increase of Ni concentration in Fe1-xNixSe0.5Te0.5. Namely thesuperconducting transition temperature (Tc) being defined as resistivity =0decrease from 12K to around 4K and 2K for x=0.01 and 0.03 samples respectively.For x=0.05 (5at% Ni at Fe site) though Tconset is observed in resistivitymeasurements but \r{ho}=0 is not seen down to 2K. For x more than 0.07, neitherthe Tconset nor Tc\r{ho}=0 is seen down 2K in R-T measurements. It isdemonstrated that Ni doping at Fe site in FeSe0.5Te0.5 superconductorsuppresses superconductivity fast. The rate of Tc depression is albeit nonmonotonic. Summarily, a systematic study on suppression of superconductivitywith Fe site Ni doping in flux free gown FeSe0.5Te0.5 single crystals ispresented in the current communication.

Fast suppression of superconductivity with Fe site Ni substitution in  Fe1-xNixSe0.5Te0.5 (x=0.0, 0.01, 0.03, 0.05, 0.07, 0.10 and 0.20) single  crystals