Antiferromagnetic spin fluctuations and superconductivity in high- Tc oxides

Abstract

Anomalous physical properties of high- T c oxides as observed in the electrical resistivity, infrared conductivity, NMR relaxation rate, etc., above their transition temperatures are shown to be well explained in terms of antiferromagnetic spin fluctuations in two-dimensional metals described by the self-consistent renormalization (SCR) theory of spin fluctuations. Superconductivity due to the spin fluctuation mechanism is treated by using the weak coupling and the strong coupling theories. The order parameter is shown to be of B 1g character and the critical temperature is evaluated to be of the right order of magnitude.