Momentum dependence of the electron-phonon coupling and self-energy effects in YBa_2Cu_3O_7 within the local density approximation

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dc.creatorHeid, Rolf
dc.creatorBohnen, Klaus-Peter
dc.creatorZeyher, Roland
dc.creatorManske, Dirk
dc.date2007-07-30
dc.date2008-02-21
dc.date.accessioned2026-07-07T09:33:19Z
dc.date.available2026-07-07T09:33:19Z
dc.descriptionUsing the local density approximation (LDA) and a realistic phonon spectrum we determine the momentum and frequency dependence of $α^2F({\bf k},ω)$ in YBa$_2$Cu$_3$O$_7$ for the bonding, antibonding, and chain band. The resulting self-energy $Σ$ is rather small near the Fermi surface. For instance, for the antibonding band the maximum of $Re Σ$ as a function of frequency is about 7 meV at the nodal point in the normal state and the ratio of bare and renormalized Fermi velocities 1.18. These values are a factor 3-5 too small compared to the experiment showing that only a small part of $Σ$ can be attributed to phonons. Furthermore, the frequency dependence of the renormalization factor $Z({\bf k},ω)$ is smooth and has no anomalies at the observed kink frequencies which means that phonons cannot produce well-pronounced kinks in stoichiometric YBa$_2$Cu$_3$O$_7$, at least, within the LDA.
dc.descriptionFigure 1 slightly revised, text shortened, accepted as a PRL
dc.identifierhttps://arxiv.org/abs/0707.4429
dc.identifierhttp://arxiv.org/abs/0707.4429
dc.identifierPhys. Rev. Lett. 100, 137001 (2008)
dc.identifierdoi:10.1103/PhysRevLett.100.137001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/159094
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleMomentum dependence of the electron-phonon coupling and self-energy effects in YBa_2Cu_3O_7 within the local density approximation
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