*
Erio Tosatti (a), Nicola Manini (a), and O. Gunnarsson (b)
(a) S.I.S.S.A., Via Beirut 4, I-34013 Trieste, Italia
(b) Max-Planck-Institut für Festkörperforschung, Stuttgart
*

We calculate the magnetic susceptibility and g-factor of the isolated
C60^{-} ion at zero temperature, with a proper
treatment of the
dynamical Jahn-Teller effect, and of the associated orbital angular
momentum, Ham-reduced gyromagnetic ratio, and molecular spin-orbit
coupling.A number of surprises emerge. First, the predicted molecular
spin-orbit splitting is very small, two orders of magnitude smaller than in
the bare carbon atom, due to the large radius of curvature of the molecular
orbit. Second, this reduced spin-orbit splitting is now wholly comparable
to Zeeman energies, for instance, in X-band EPR at 3.39KGauss. Hence, a
field dependence of the g-factor is predicted. Third, we find that the
orbital gyromagnetic factor is strongly reduced by vibron coupling, and so
therefore are the effective weak-field g-factors of all low-lying
states. In particular, the ground state of C_{60}^{-}
is predicted to show a negative g-factor of ~-0.1.

Phys. Rev. B ** 54**, 17184 (1996).

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