High-Field Transport Properties of T'-Ln2-xCexCuO4(Ln=Nd, Pr, La)

We report low-temperature magnetotransport in the normal state of the electron-doped superconductors, Nd_2-xCe_xCuO₄, Pr_2-xCe_xCuO₄ and La_2-xCe_xCuO₄, by suppressing the superconductivity with high magnetic fields. The normal state ρ - T curve shows an up-turn at low temperatures, which has a log T dependence with saturation at lowest temperatures. The up-turn is gradually suppressed with increasing 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.