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

Komarov, K. K.; Dzebisashvili, D. M. DOI: 10.1088/1402-4896/ab8163Physica Scripta.

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.