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We report on Cr doping effect in Mn3Sn polycrystalline films with bothuniform and modulation doping. It is found that Cr doping with lowconcentration does not cause notable changes to the structural and magneticproperties of Mn3Sn, but it significantly enhances the anomalous Hallconductivity, particularly for modulation-doped samples at low temperature. AHall conductivity as high as 184.8 {\Omega}-1 cm-1 is obtained formodulation-doped samples at 50 K, in a sharp contrast to vanishingly smallvalues for undoped samples at the same temperature. We attribute theenhancement to the change of Fermi level induced by Cr doping

Giant enhancement of anomalous Hall effect in Cr modulation-doped non-collinear antiferromagnetic Mn3Sn thin films