Nesting Mechanism for d-symmetry Superconductors

TL;DR

This paper investigates how nesting features of the Fermi surface promote high-temperature d-wave superconductivity in cuprates, showing the transition temperature's dependence on nesting quality and aligning with experimental data.

Contribution

It introduces a nesting mechanism that explains high-temperature d-wave superconductivity and its sensitivity to Fermi surface nesting in cuprates.

Findings

Nesting of the Fermi surface favors d-wave superconductivity.

Transition temperature decreases with reduced nesting.

Results align with photo-emission data on cuprates.

Abstract

A nested Fermi surface with nearly parallel orbit segments is found to yield a singlet d-wave superconducting state at high temperatures for a restricted range of the on-site Coulomb repulsion that avoids the competing spin density wave instability. The computed superconducting transition temperature drops dramatically as the nesting vector is decreased, in accord with recent photo-emission data on the Bi2212 and Bi2201 cuprates.