Temperature dependence of the electronic structure near $E_F$ and electron-phonon interaction in ${\mathrm{C}}_{60}/\mathrm{A}\mathrm{g}\left(100\right)\mathrm{}$ single layers

Here we report on a ${\mathrm{C}}_{60}$-based material, namely one ordered monolayer of ${\mathrm{C}}_{60}$ on Ag(100). In this system, the ${\mathrm{C}}_{60}$ molecules are close to the ionic state ${\mathrm{C}}_{60}^{3\mathrm{-}}$ and the ${\mathrm{C}}_{60}{-\mathrm{C}}_{60}$ distance is comparable to that of ${\mathrm{Cs}}_3{\mathrm{C}}_{60}.$ The photoemission spectra of the LUMO-derived band clearly indicate a metallic character at room temperature, while below $120\pm 10\mathrm{K}$ we observe a considerable reduction of density of states at the Fermi level. The electron-phonon coupling and the physical reasons for the observed behavior are addressed.