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Electron-doping of the semimetal (CeOFeAs) by either fluorine (max Tc ~ 43K)or cobalt (max Tc ~ 11 K) leads to superconductivity. Here we show the effectof transition metal (Co) substitution at the iron site on the superconductingproperties of CeO0.9F0.1FeAs (Tc ~38 K)to understand the interplay of chargecarriers in both the rare earth-oxygen and Fe-As layers. Simultaneous doping ofequivalent number of charge carriers in both layers leads to a Tc of 9.8 Kwhich is lower than the Tc obtained when either the conducting layer (CeAs) orcharge reservoir layer (CeO) is individually doped. This suggests a clearinterplay between the two layers to control the superconductivity. Theresistivity shows a T2 dependence (T >>Tc) which indicates strongelectron-electron correlation. Hall coefficient and thermoelectric powerindicate increased carrier concentration with cobalt doping in CeO0.9F0.1FeAs.The rf penetration depth both for CeO0.9F0.1Fe0.95Co0.05As and CeO0.9F0.1FeAsshow an exponential temperature dependence with a gap value of ~ 1.6 and 1.9meV. A resistance minimum is observed in the normal state near Tc which alsoshows negative magnetoresistance and provides evidence for the onset of weaklocalization.

Strong electron-electron correlation and weak localization in CeO_{0.9}F_{0.1}Fe_{1-x}Co_xAs