Surprises in the Orbital Magnetic Moment and g-Factor of the Dynamic Jahn-Teller Ion C_{60}^-

Abstract

We calculate the magnetic susceptibility and g-factor of the isolated C_{60}^- 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 two orders of magnitude smaller than in the bare carbon atom, due to the large radius of curvature of the molecule. Second, this reduced spin-orbit splitting is comparable to Zeeman energies, for instance, in X-band EPR at 3.39KGauss, and a field dependence of the g-factor is predicted. Third, 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 doublet of C_{60}^- is predicted to show a negative g-factor of \sim -0.1.

19 pages RevTex, 2 postscript figures included

References in corpus (8)

• Electron--Vibron Interactions and Berry Phases in Charged Buckminsterfullerene: Part I
• Electron--Vibron Interactions in Charged Buckminsterfullerene: Pair Energies and Spectra (Part II)
• Anomalous low-energy electron attachment in C_{60}
• Dynamical Jahn-Teller Effect and Berry Phase in Positively Charged Fullerene I. Basic Considerations
• The Phase Diagram of Correlated Electrons in a Lattice of Berry Molecules
• Enhanced Electron Pairing in a Lattice of Berry Phase Molecules
• Quantum fluctuations of $D_{5d}$ polarons on $C_{60}$ molecules
• Phase Diagram of a Model of Correlated Hopping of Electrons in a Lattice of Berry Molecules

Cited by in corpus (7)

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• Theory for transport through a single magnetic molecule: Endohedral N@C60
• Molecular terms, magnetic moments and optical transitions of molecular ions C60+/-
• Hund's rule Magnetism in C60 ions?
• Spin-orbital model for fullerides
• Jahn-Teller distortions and excitation energies in C60(n+)
• Dynamical Jahn-Teller effect in the first excited C${}_{60}^{-}$