F. Marsiglio and J.E. Hirsch. cond-mat/0005002 (Los Alamos). Presented at the 6th International Conference on Materials and Mechanisms of Superconductivity, Houston, February 2000, , Physica C 341-348, 2217 (2000).
We calculate the doping dependence of the penetration depths and optical sum rule violation in La2-xSrxCuO4 within the model of hole superconductivity. In the clean limit the predicted in-plane sum rule violation is larger than the c-axis one, however in the presence of disorder the latter one becomes very substantially enhanced.