## Abstract

We study a simplified model of C60, where the electrons move freely on the surface of a sphere. The total energy in the presence of an adjustable repulsive interaction is computed by first- and second-order perturbation theory. The second-order results yield an effective attraction (pair binding) between electrons which are added above a closed angular-momentum shell. For different regimes of interaction parameters, we find an L=0 singlet and an L=1 triplet ground state. Pair binding occurs at larger couplings for longer-range interactions. We estimate the third-order corrections, and define the region where the second-order predictions are expected to hold. The relevance of this model to superconductivity and ferromagnetism in doped fullerenes is discussed.

Original language | English |
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Pages (from-to) | 331-341 |

Number of pages | 11 |

Journal | Physical Review B |

Volume | 46 |

Issue number | 1 |

DOIs | |

State | Published - 1992 |

## ASJC Scopus subject areas

- Condensed Matter Physics