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Strong superconductivity with local Jahn-Teller phonons in C60 solids.
J E Han1, O Gunnarsson, V H Crespi
1Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, USA.
Physical Review Letters
|May 7, 2003
Summary
Fulleride superconductivity arises from local electron pairing mediated by Jahn-Teller phonons. This pairing overcomes Coulomb repulsion, explaining the strong doping dependence of the critical temperature (Tc) observed experimentally.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Fulleride materials exhibit superconductivity, a phenomenon where electrical resistance vanishes below a critical temperature.
- Understanding the mechanisms behind fulleride superconductivity is crucial for developing new superconducting materials.
Purpose of the Study:
- To analyze fulleride superconductivity at experimental doping levels.
- To investigate the roles of electron-electron and electron-phonon interactions in this phenomenon.
Main Methods:
- Theoretical analysis treating electron-electron and electron-phonon interactions equally.
- Modeling the influence of Jahn-Teller phonons on electron pairing.
Main Results:
- Jahn-Teller phonons induce local (intramolecular) electron pairing.
- This pairing demonstrates significant resistance to Coulomb repulsion, even in low-bandwidth systems.
- A strong doping dependence of the critical temperature (Tc) is predicted and found to be consistent with experimental data.
Conclusions:
- The study provides a theoretical framework explaining fulleride superconductivity.
- The findings highlight the importance of Jahn-Teller phonons and local pairing in fullerides.
- The results offer a more comprehensive understanding compared to standard Eliashberg theory.