η collective mode as A1g Raman resonance in cuprate superconductors
X. Montiel, T. Kloss, C. Pépin, S. Benhabib, Y. Gallais, A. Sacuto
DOI 10.1103/PhysRevB.93.024515 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We discuss the possible existence of a spin singlet excitation with charge ±2 (η mode) originating the A1g Raman resonance in cuprate superconductors. This η mode relates the d-wave superconducting singlet pairing channel to a d-wave charge channel. We show that the η boson forms a particle-particle bound state below the 2Δ threshold of the particle-hole continuum where Δ is the maximum d-wave gap. Within a generalized random phase approximation and Bethe-Salpeter approximation study, we find that this mode has energies similar to the resonance observed with inelastic neutron scattering below the superconducting (SC) coherent peak at 2Δ in various SC cuprate compounds. We show that it is a very good candidate for the resonance observed in Raman scattering below the 2Δ peak in the A1g symmetry. Since the η mode sits in the S=0 channel, it may be observable via Raman, x-ray, or electron energy loss spectroscopy probes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Resonance mode in B1g Raman scattering: A way to distinguish between spin-fluctuation and phonon-mediated d-wave superconductivity
similarity 0.96A. V. Chubukov et al.
Source status unknown — claims are unverified
Electronic Spectra and Their Relation to the (π,π) Collective Mode in High- Tc Superconductors
similarity 0.95J. C. Campuzano et al.
Source status unknown — claims are unverified
Collective spin fluctuation mode and Raman scattering in superconducting cuprates
similarity 0.95F. Venturini et al.
Source status unknown — claims are unverified
Dispersion of the neutron resonance in cuprate superconductors
similarity 0.95Andrey V. Chubukov et al.
Source status unknown — claims are unverified
Strong coupling behavior of the neutron resonance mode in unconventional superconductors
similarity 0.95Patrik Hlobil et al.
Source status unknown — claims are unverified
Anomalous softening of phonon dispersion in cuprate superconductors
similarity 0.95Saheli Sarkar et al.
Source status unknown — claims are unverified