Electron-phonon coupling and superconductivity in alkali-intercalated C60 solid
Abstract
We propose that superconductivity in A3C60 (A=K, Rb) with Tc>=30 K results from a favorable combination of high phonon frequencies and the existence of two different energy scales optimizing the coupling constant λ=NV. Calculations show that electron scattering V is dominated by particular on-ball Jahn-Teller-type modes on the scale of the large on-ball π-hopping energy, while the density of states N is controlled by the weak interball hopping energy. This factorization has several observed experimental consequences. Crucial differences to intercalated graphite explain the much smaller Tc values in the graphite compounds.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 1992
- DOI:
- 10.1103/PhysRevLett.68.526
- Bibcode:
- 1992PhRvL..68..526S
- Keywords:
-
- Buckminsterfullerene;
- Doped Crystals;
- Superconductivity;
- Transition Temperature;
- Electron Orbitals;
- Electron Phonon Interactions;
- Graphite;
- Potassium;
- Rubidium;
- Solid-State Physics;
- 74.20.-z;
- 71.25.-s;
- 71.38.+i;
- 71.45.Nt;
- Theories and models of superconducting state