Abstract
The interplay between hole doping, spin fluctuations, and unusual normal-state properties in layered cuprates is relevant for the physics of high temperature superconductors. For better understanding of the role of magnetic interactions on the conduction mechanism, a systematic study of the normal-state resistivity ρ(x,T) of the La1.85Sr0.15(Cu1−xLix)O4 system with 0.0⩽x⩽0.15 was performed down to 4.2 K. A logarithmic contribution was found to properly describe the ρ(x,T) deviation from linearity as Tc is approached. Scattering of the carriers by spin fluctuations at the Cu–O2 conduction planes is proposed to be the source of the Kondo-like behavior. Negative magnetoresistance measurements up to 8 T, with an increasing intensity with x, confirm the role of spin degrees in the resistivity behavior.
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