Electron-phonon coupling in A15 Cs$_3$C$_{60}$ and fcc alkali fullerides

We study the electron-phonon couplings of alkali-doped fullerides, fcc A$_3$C$_{60}$ (A=K,Rb) and A15 Cs$_3$C$_{60}$, using first-principles method based on the density functional theory. To improve the previous studies, we perform accurate calculations of phonon dispersion and electron-phonon coupling including momentum dependence and lattice symmetry. Furthermore, to estimate the superconducting transition temperature, we use Eliashberg equation instead of McMillan's formula. It is found that Eliashberg equation gives a quantitative improvement and that the obtained transition temperatures are reasonable compared to the experiments.