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Coulomb couplings in positively charged fullerene

机译:带正电的富勒烯中的库仑偶联

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摘要

We compute, based on density-functional electronic-structure calculations, the Coulomb couplings in the h_u highest occupied orbital of molecular C_(60). We obtain a multiplet-averaged Hubbard U ≈ 3 eV, and four Hund-rule-like intramolecular multiplet-splitting terms, each of the order of a few hundred millielectronvolts. According to these couplings, all C_(60)~(n+) ions should possess a high-spin ground state if kept in their rigid undistorted form. Even after molecular distortions are allowed, however, the Coulomb terms still appear to be somewhat stronger than the previously calculated Jahn-Teller couplings, the latter favouring low-spin states. Thus for example in C_(60)~(2+), unlike C_(60)~(2-), the balance between the Hund rule and Jahn-Teller yields, even if marginally, a high-spin ground state. That seems surprising in view of reports of superconductivity in field-doped C_(60)~(n+) systems.
机译:我们基于密度函数电子结构计算,计算了分子C_(60)的h_u最高占据轨道中的库仑耦合。我们获得了多重平均的Hubbard U≈3 eV,以及四个像洪德规则一样的分子内多重分裂项,每个项的大小为几百毫伏。根据这些耦合,所有C_(60)〜(n +)离子如果保持其刚性,不变形的形式,则应具有高自旋基态。然而,即使在允许分子畸变之后,库仑项仍似乎比先前计算的Jahn-Teller耦合强一些,后者倾向于低自旋态。因此,例如在C_(60)〜(2+)中,与C_(60)〜(2-)不同,Hund规则和Jahn-Teller之间的平衡即使有一点点也产生了高旋转的基态。鉴于在场掺杂的C_(60)〜(n +)系统中具有超导性的报道,这似乎令人惊讶。

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