Magnetic and phonon mechanisms of superconductivity in La${}_{2-x}$Sr${}_x$CuO${}_4$ support each other

S. G. Ovchinnikov, E. I. Shneyder

Strong electron correlations are responsible both for the insulator ground state of undoped La${}_2$CuO${}_4$ and strong antiferromagnetic coupling $J$ between neighbouring spins. We c…