English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Using the local density approximation (LDA) and a realistic phonon spectrumwe determine the momentum and frequency dependence of $\alpha^2F({\bfk},\omega)$ in YBa$_2$Cu$_3$O$_7$ for the bonding, antibonding, and chain band.The resulting self-energy $\Sigma$ is rather small near the Fermi surface. Forinstance, for the antibonding band the maximum of $Re \Sigma$ as a function offrequency is about 7 meV at the nodal point in the normal state and the ratioof bare and renormalized Fermi velocities 1.18. These values are a factor 3-5too small compared to the experiment showing that only a small part of $\Sigma$can be attributed to phonons. Furthermore, the frequency dependence of therenormalization factor $Z({\bf k},\omega)$ is smooth and has no anomalies atthe observed kink frequencies which means that phonons cannot producewell-pronounced kinks in stoichiometric YBa$_2$Cu$_3$O$_7$, at least, withinthe LDA.

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