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Apparent electron-phonon interaction in strongly correlated systems.

O Rösch¹, O Gunnarsson

¹Max-Planck-Institut für Festkörperforschung, D-70506 Stuttgart, Germany.

Physical Review Letters

|December 17, 2004

Summary

Electron-phonon interactions in cuprates depend on the property measured. Doping reduces the interaction

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Area of Science:

Condensed Matter Physics
Materials Science
Solid-State Physics

Background:

Strongly correlated solids, particularly high-temperature cuprate superconductors, exhibit complex electron-phonon interactions.
Understanding these interactions is crucial for elucidating superconductivity mechanisms.

Purpose of the Study:

To investigate the dependence of electron-phonon interaction strength on the measured property in doped cuprates.
To reconcile theoretical predictions with experimental observations in photoemission spectroscopy.

Main Methods:

Application of sum rules to analyze electron-phonon coupling.
Theoretical modeling of the electron and phonon self-energies in the presence of charge carriers.

Main Results:

The apparent strength of electron-phonon interaction is shown to be property-dependent.
For doped cuprates with a small charge carrier fraction (delta), the interaction's influence on phonon self-energy is reduced by a factor of delta.
No corresponding reduction is observed in the electron self-energy, indicating a persistent strong coupling.

Conclusions:

The findings support interpretations of recent photoemission experiments.
A strong coupling to phonons is consistent with the observed behavior in doped cuprates.
The study highlights the nuanced nature of electron-phonon interactions in these materials.

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