ARPES Spectra of Bi2212 give the Coulomb Coupling $λ^{C}\approx 1$ and the Electron-Phonon Coupling $λ^{EP}=2-3$
| dc.creator | Kulic, Miodrag L. | |
| dc.creator | Dolgov, Oleg V. | |
| dc.date | 2006-10-19 | |
| dc.date | 2007-04-09 | |
| dc.date.accessioned | 2026-07-07T07:55:36Z | |
| dc.date.available | 2026-07-07T07:55:36Z | |
| dc.description | We show that the double kink-structure in the electronic self-energy of Bi2212 near the nodal point at low energy $ω_{1}\approx 50-70$ $meV$ and at high energy at $ω_{2}\approx 350$ $meV$, observed recently in the ARPES measurements by Valla et al \cite{Valla-2006}, gives that the electron-phonon (EPI) coupling constant $λ_{z}^{EP}$in the normal part of the self-energy $Σ(ω)$ is twice larger than the Coulomb coupling $λ_{z}^{C}$. The experimental data for $\func{Re}Σ(ω)$ up to energies $\sim 350$ $meV$ can be satisfactory explained by $% λ_{z}^{EP}\approx 2.1$ and $λ_{z}^{C}\approx 1.1$. Additionally the low energy slope of the ARPES $\func{Re}Σ(ω)$ at $ω<20$ $meV$ \cite{Valla-2006} gives a hint that the low energy phonons might contribute significantly to the EPI coupling, i.e. $λ_{z}^{low,EP}>1$, thus giving the total EPI coupling constant $λ_{z,tot}^{EP}=λ_{z}^{EP}+λ_{z}^{low,EP}>3$. In order to test the role of low frequency phonons by ARPES measurements a much better momentum resolution is needed than that reported in \cite{Valla-2006}. Possible pairing scenarios based on ARPES, tunnelling and magnetic neutron scattering measurements are discussed. | |
| dc.description | 4 pages, 1 figure | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0610549 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0610549 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/127024 | |
| dc.subject | Superconductivity | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | ARPES Spectra of Bi2212 give the Coulomb Coupling $λ^{C}\approx 1$ and the Electron-Phonon Coupling $λ^{EP}=2-3$ | |
| dc.type | text |