Finite systems studies and the mechanism of high Tc (pdf)

"Mechanisms of High Temperature Superconductivity" (Proceedings of the 2nd. NEC Symposium, Hakone, Japan, October 1988)), Springer, Berlin, 1989, p. 34.

I discuss results of exact and Monte Carlo calculations of models for the oxide superconductors. These results show that magnetic mechanisms are highly unlikely to lead to high temperature superconductivity. A Cu-O charge-transfer excitation is found to be a possible mechanism for pairing of oxygen holes, if the parameters are right. However, the body of experimental results and our results for small systems point to another, novel and highly universal mechanism for superconductivity in these and other materials.