Effect of On-site Coulomb Repulsion on Ferromagnetic Fluctuations in Heavily Overdoped Cuprates

We theoretically study ferromagnetic (FM) fluctuations in the heavily overdoped region of cuprate superconductors. To explore the origin of FM fluctuations, we evaluate the spin susceptibilities of a single-band Hubbard model within the fluctuation exchange approximation. Model parameters are derived using the Wannierization technique and the constrained random phase approximation method based on the maximally localized Wannier functions. The constrained random phase approximation calculations reveal that the on-site Coulomb interaction decreases with an increase in hole doping. This reduction of the on-site Coulomb interaction leads to the emergence of FM fluctuations in heavily overdoped cuprates.

Automated summary

The study theoretically investigates ferromagnetic fluctuations in heavily overdoped cuprate superconductors, with the findings indicating that a decrease in on-site Coulomb interaction leads to the emergence of ferromagnetic fluctuations in this regime.