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

Abstract

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 the holes on 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 La${}_{2-x}$Sr${}_x$CuO${}_4$ in a wide range around optimal doping.

17 pages, 3 figures

References in corpus (6)

• Evidence for complex order parameter in La_{1.83}Sr_{0.17}CuO_4
• The Hubbard model within the equations of motion approach
• Universal observation of multiple order parameters in cuprate superconductors
• Characteristics of the Mott transition and electronic states of high-temperature cuprate superconductors from the perspective of the Hubbard model
• Dispersion of the dielectric function of a charge-transfer insulator
• Coulomb repulsion of holes and competition between d_{x^2-y^2}-wave and s-wave parings in cuprate superconductors

Cited by in corpus (1)

• In-plane p-wave coherence length in iron-based superconductors