Abstract
We studied the low temperature transport behavior and its dependence on applied magnetic field for dilute Mn-doped NaγCo1−xMnxO2 (x=0, 0.03, 0.07, 0.1). Strikingly, a resistivity minimum was discovered for all the doped samples at low temperatures and was weakly dependent on the external magnetic field. Combining with the susceptibility measurements, the results prove the coexistence of Kondo scattering and possibly enhanced electron-electron (e-e) interaction induced by dilute Mn doping. This signature of e-e interaction may reflect a typical characteristic of strong correlation systems.
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