Effect of Coulomb repulsion on the London penetration depth in cuprate superconductors

We study the effect of Coulomb repulsion between oxygen holes on the London penetration depth lambda based on the concept of spin-polaron nature of Fermi quasiparticles in cuprates superconductors. It is shown that for the generally accepted values of the parameters of the spin-fermion model, taking into account the Coulomb interaction, both the one-site Hubbard U-p and interaction between holes on the next-nearest-neighbor oxygen ions V-2, allows one to achieve a much better agreement of the calculated temperature dependencies of the value lambda(-2) with the experimental data in La2-xSrxCuO4 in a wide range around optimal doping.