Abstract.
We investigate the occurrence of Hund’s rule magnetism in C\(_{60}^{n\pm}\) molecular ions, by computing the ground-state spin for all charge states n from -3 to +5. The two competing interactions, electron-vibration (e-v, including Jahn Teller, favoring low spin) and electron-electron (e-e, including Hund-rule exchange, favoring high spin), are accounted for based on previously computed ab initio coupling parameters. Treating the ion coordinates as classical, we first calculate and classify the static Jahn-Teller distorted states for all n, inclusive of both e-v and e-e effects. We then correct the adiabatic result by including the zero-point energy lowering associated with softening of vibrations at the adiabatic Jahn-Teller minima. Our overall result is that while, like in previous investigations, low-spin states prevail in negative ions, Hund’s rule high spin dominates all positive C60 n+ ions. This suggests also that Hund-rule magnetism could arise in fullerene cation-based solid state compounds, particularly those involving C60 2+.
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Received: 17 April 2003, Published online: 22 September 2003
PACS:
36.40.Cg Electronic and magnetic properties of clusters - 61.48.+c Fullerenes and fullerene-related materials (structure) - 71.20.Tx Fullerenes and related materials; intercalation compounds (electronic structure) - 75.75.+a Magnetic properties of nanostructures
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Lüders, M., Manini, N., Gattari, P. et al. Hund’s rule magnetism in C \(\mathsf{_{60}}\) ions?. Eur. Phys. J. B 35, 57–68 (2003). https://doi.org/10.1140/epjb/e2003-00256-6
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DOI: https://doi.org/10.1140/epjb/e2003-00256-6