Abstract
We have performed resistivity and inelastic neutron scattering measurements on three samples of Fe${}_{0.98\ensuremath{-}z}$Cu${}_{z}$Te${}_{0.5}$Se${}_{0.5}$ with $z=0$, 0.02, and 0.1. It is found that with increasing Cu doping the sample's resistivity deviates progressively from that of a metal. However, in contrast to expectations that replacing Fe with Cu would suppress the magnetic correlations, the low-energy ($\ensuremath{\le}12$ meV) magnetic scattering is enhanced in strength, with greater spectral weight and longer dynamical spin-spin correlation lengths. Such enhancements can be a consequence of either enlarged local moments or a slowing down of the spin fluctuations. In either case, the localization of the conduction states induced by the Cu doping should play a critical role. Our results are not applicable to models that treat 3$d$ transition metal dopants simply as effective electron donors.
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