What is the Pairing Glue in the Cuprates? Insights from Normal and Anomalous Propagators

Abstract

Both the pairing and the pair-breaking modes lead to similar kinks of the electron dispersion curves in superconductors, and therefore the photoemission spectroscopy can not be straightforwardly applied in search for their pairing glue. If the momentum-dependence of the normal and anomalous self-energy can be neglected, manipulation with the data does allow us to extract the gap function $\Delta (\omega )$ and therefore also the pairing glue. However, in the superconducting cuprates such procedure may not be justified. In this paper we point out that the pairing glue is more directly visible in the spectral function of the Nambu-Gor'kov anomalous propagator and we demonstrate that this function is in principle experimentally observable.

12 pages, 4 figures

References in corpus (3)

• Extending Universal Nodal Excitations Optimizes Superconductivity in Bi2Sr2CaCu2O8+d
• The Origin and Non-quasiparticle Nature of Fermi Arcs in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Pre-pairing and the "Filling" Gap in the Cuprates From the Tomographic Density of States

Cited by in corpus (7)

• Microscopic interpretation of the Dynes formula for the tunneling density of states
• Antagonistic effects of nearest-neighbor repulsion on the superconducting pairing dynamics in the doped Mott insulator regime
• Odd-frequency superconductivity near a magnetic impurity in a conventional superconductor
• Consistent two-lifetime model for spectral functions of superconductors
• Superconductivity in systems exhibiting the Altshuler-Aronov anomaly
• Model-independent determination of the gap function of nearly localized superconductors
• Advanced approach of superconducting gap function extraction from tunneling experiments