ELECTRICAL-RESISTIVITY IN THE EMERY MODEL - T2 VERSUS T LAW IN 2 DIMENSIONS

On the basis of the Emery model for the CuO2 planes in Cu-oxide superconductors, the electrical resistivity due to the inelastic scattering of O holes by arbitrary-wavelength (preferably antiferromagnetic) spin fluctuations of the Cu spins is calculated. Using a Fermi-liquid model for the wavevector- and frequency dependent spin susceptibility, it is found that the temperature dependence of the two-dimensional spin-fluctuation resistivity is quadratic at low temperatures and linear at high temperatures. From this and the calculation of the absolute resistivity values which are found to be of the experimentally observed magnitude, we conclude that the normal-state in-plane resistivity in Cu-oxide superconductors, in particular the observed non-linear temperature dependences, may be explained by two-dimensional spin-fluctuation scattering in the Fermi-liquid picture.