Angle and frequency dependence of self-energy from spin fluctuations mediated d-wave pairing for high temperature superconductors

TL;DR

This study models the self-energy in high-temperature cuprate superconductors using Eliashberg formalism and experimentally measured spin susceptibility, revealing detailed momentum and frequency dependence across doping levels.

Contribution

It provides a comprehensive analysis of the self-energy's momentum and frequency dependence in cuprates based on experimental spin susceptibility data.

Findings

Self-energy varies with doping and momentum.

Results align with ARPES experimental data.

Detailed frequency dependence of spin-fluctuation mediated pairing.

Abstract

We investigated the characteristics of the spin fluctuations mediated superconductivity employing the Eliashberg formalism. The effective interaction between electrons was modeled in terms of the spin susceptibility measured by the inelastic neutron scattering experiments on single crystal La2-xSrxCuO4 superconductors. The diagonal self-energy and off-diagonal self-energy were calculated by solving the coupled Eliashberg equation self-consistently for chosen spin susceptibility and tight-binding dispersion of electrons. The full momentum and frequency dependence of the self-energy is presented for the optimal, overdoped, and underdoped LSCO cuprates in superconductive state. These results may be compared with the experimentally deduced self-energy from ARPES experiments.