Do the A4c60 Fullerides Have a Broken-Symmetry Ground State?

Abstract

Band theory predicts both K3C60 and K4C60 to be metals; various experimental probes show that while K3C60 is indeed metallic, K4C60 appears to be insulating. The standard view of this apparent failure of the single-particle picture is that electron correlation is predominant. We describe an alternative scenario, motivated on theoretical grounds, which invokes a spin- or charge-density-wave state to explain the observed insulating behavior.

9 pages + 3 figures, REVTeX 3.0

References in corpus (1)

• Electronic Structure of Superconducting Ba6c60

Cited by in corpus (5)

• Superconductivity in Fullerides
• Metal-insulator transitions: Influence of lattice structure, Jahn-Teller effect, and Hund's rule coupling
• Important role of alkali atoms in A4C60
• Metal-insulator transitions in systems with electron-phonon and Coulomb interactions
• Tight-Binding Parametrization of First-Principles Electronic Dispersion in Orientationally Disordered A3c60