Magnetic mechanism of quasiparticle pairing in hole-doped cuprate superconductors

TL;DR

This study calculates magnetic spectral functions in hole-doped cuprates using a Hubbard model, revealing that magnetic excitations across a broad energy range contribute to superconducting pairing, aligning with experimental transition temperatures.

Contribution

It provides a comprehensive magnetic response analysis within the Hubbard model, showing the significance of both low and high-energy magnetic excitations in pairing mechanisms.

Findings

Magnetic response includes low and high-energy excitations.

Calculated transition temperatures match experimental data.

Magnetic excitations are crucial for pairing in cuprates.

Abstract

We have computed alpha^2F's for the hole-doped cuprates within the framework of the one-band Hubbard model, where the full magnetic response of the system is treated properly. The d-wave pairing weight alpha^2F_d is found to contain not only a low energy peak due to excitations near (pi,pi) expected from neutron scattering data, but to also display substantial spectral weight at higher energies due to contributions from other parts of the Brillouin zone as well as pairbreaking ferromagnetic excitations at low energies. The resulting solutions of the Eliashberg equations yield transition temperatures and gaps comparable to the experimentally observed values, suggesting that magnetic excitations of both high and low energies play an important role in providing the pairing glue in the cuprates.