The magnetic resonance in high-temperature superconductors: Evidence for an extended s-wave pairing symmetrysymmetry

TL;DR

This paper presents evidence from neutron scattering data indicating that high-temperature superconductors likely have an extended s-wave pairing symmetry with eight line nodes, challenging the traditional d-wave model.

Contribution

The study demonstrates that neutron scattering data align with an extended s-wave (A_1g) pairing symmetry, providing a new perspective on the pairing mechanism in cuprates.

Findings

Neutron data support extended s-wave symmetry with eight line nodes.

The pairing symmetry changes sign across nodes.

Extended s-wave may be mediated by charge fluctuations.

Abstract

We have identified several important features in the neutron scattering data of cuprates, which are difficult to be explained in terms of d-wave and isotropic s-wave order parameters. Alternatively, we show that the neutron data are in quantitative agreement with an order parameter that has an extended s-wave (A_1g) symmetry and opposite sign in the bonding and antibonding electron bands formed within the Cu_{2}O_{4} bilayers. The extended s-wave has eight line nodes and change signs when a node is crossed. This A_1g pairing symmetry may be compatible with a charge fluctuation mediated pairing mechanism.