The magnetic resonance in high-temperature superconductors: evidence for an extended s-wave pairing symmetry

Abstract

We have identified several important features in the neutron scattering data of cuprates that are difficult to explain 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 Cu₂O₄ bilayers. The extended s wave has eight line nodes and changes sign when a node is crossed. This A_1g pairing symmetry may be compatible with a charge-fluctuation-mediated pairing mechanism.

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Additional information

Notes on contributors

Guo-meng Zhao †

Email: [email protected].