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We have performed resistivity and inelastic neutron scattering measurementson three samples of Fe0.98-zCuzTe0.5Se0.5 with z = 0, 0.02, and 0.1. It isfound that with increasing Cu doping the sample's resistivity deviatesprogressively from that of a metal. However, in contrast to expectations thatreplacing Fe with Cu would suppress the magnetic correlations, the low-energy(no larger than 12 meV) magnetic scattering is enhanced in strength, withgreater spectral weight and longer dynamical spin-spin correlation lengths.Such enhancements can be a consequence of either enlarged local moments or aslowing down of the spin fluctuations. In either case, the localization of theconduction states induced by the Cu doping should play a critical role. Ourresults are not applicable to models that treat 3d transition metal dopantssimply as effective electron donors.

Enhanced low-energy magnetic excitations via suppression of the itinerancy in Fe0.98-zCuzTe0.5Se0.5