Antiferromagnetic spin fluctuations and high- T C superconductivity

Abstract

A consistent picture for cuprate oxide superconductors emerges from the view-point of antiferromagnetic spin fluctuations in two-dimension. In particular, anomalous normal state properties are well explained by the self-consistent renormalization theory of spin fluctuations. This theory naturally describes a crossover from fermi-liquid regime at low temperatures to the unusual normal state at higher temperatures. The crossover temperature is small and consistent with experiments. Superconductivity due to the spin fluctuations leads to an anisotropic pairing with B 1 g symmetry. The transition temperature estimated by the strong coupling theory is of the right order of magnitude.