Abstract
The effect of carrier concentration on fulleride superconductivity is studied by x ray, Raman, magnetization, and ESR of two new cubic families: and ( , , Rb, or Cs). These are isostructural with known and trivalent superconductors, respectively, but with variable valence . is peaked at or very near , decreasing rapidly in either direction to for and 5. These results underscore the failure of both one-electron and strong correlation models to explain the dependence of on band filling.
- Received 27 November 1995
DOI:https://doi.org/10.1103/PhysRevLett.77.167
©1996 American Physical Society