Han J E, Gunnarsson O, Crespi V H
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, USA.
Phys Rev Lett. 2003 Apr 25;90(16):167006. doi: 10.1103/PhysRevLett.90.167006.
We analyze fulleride superconductivity at experimental doping levels, treating the electron-electron and electron-phonon interactions on an equal footing, and demonstrate that the Jahn-Teller phonons create a local (intramolecular) pairing which is surprisingly resistant to the Coulomb repulsion, despite the weakness of retardation in these low-bandwidth systems. The requirement for coherence throughout the solid then yields a very strong doping dependence to T(c), one consistent with experiment and much stronger than expected from standard Eliashberg theory.
我们在实验掺杂水平下分析富勒烯超导性，平等对待电子 - 电子相互作用和电子 - 声子相互作用，并证明 Jahn - Teller 声子产生了一种局域（分子内）配对，尽管这些低带宽系统中的延迟较弱，但这种配对对库仑排斥具有惊人的抗性。然后，整个固体中相干性的要求导致超导转变温度(T_c)对掺杂有非常强的依赖性，这与实验一致，且比标准 Eliashberg 理论预期的要强得多。
