Relevance of multiband Jahn-Teller effects on the electron-phonon interaction in $A_3$C$_{60}$

Details Relevance of multiband Jahn-Teller effects on the electron-phonon interaction in $A_3$C$_{60}$ Relevance of multiband Jahn-Teller effects on the electron-phonon interaction in $A_3$C$_{60}$

2004-06-28

arxiv.org/abs/cond-mat/0406685v1

Physics

Condensed Matter

Superconductivity

5 pages, 3 eps figures

Scientific paper

10.1103/PhysRevB.72.054521

Assessing the effective relevance of multiband effects in the fullerides is of fundamental importance to understand the complex superconducting and transport properties of these compounds. In this paper we investigate in particular the role of the multiband effects on the electron-phonon (el-ph) properties of the $t_{1u}$ bands coupled with the Jahn-Teller intra-molecular $H_g$ vibrational modes in the C$_{60}$ compounds. We show that, assuming perfect degeneracy of the electronic bands, vertex diagrams arising from the breakdown of the adiabatic hypothesis, are one order of magnitude smaller than the non-crossing terms usually retained in the Migdal-Eliashberg (ME) theory. These results permit to understand the robustness on ME theory found by numerical calculations. The effects of the non degeneracy of the $t_{1u}$ in realistic systems are also analyzed. Using a tight-binding model we show that the el-ph interaction is mainly dominated by interband scattering within a single electronic band. Our results question the reliability of a degenerate band modeling and show the importance of these combined effects in the $A_3$C$_{60}$ family.

Affiliated with

Also associated with

No associations

Rating

Relevance of multiband Jahn-Teller effects on the electron-phonon interaction in $A_3$C$_{60}$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Relevance of multiband Jahn-Teller effects on the electron-phonon interaction in $A_3$C$_{60}$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relevance of multiband Jahn-Teller effects on the electron-phonon interaction in $A_3$C$_{60}$ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-385411