Kondo effect in the normal state of T′-Ln2−xCexCuO4 (Ln=La, Pr, Nd) Original Research Article

We have measured low-temperature magnetotransport in the normal state of the electron-doped superconductors, Nd2−xCexCuO4, Pr2−xCexCuO4, and La2−xCexCuO4, by suppressing the superconductivity with high magnetic fields. The normal state ρ–T curve shows an up-turn at low temperatures, which has a dependence with saturation at lowest temperatures. The up-turn is gradually suppressed by increasing the magnetic field, resulting in negative magnetoresistance. We discuss these findings on the basis of the Kondo scattering originating from the magnetic moments of Cu2+ ions.