Spin-Vibronic Superexchange in Mott-Hubbard Fullerides | Zendy

Liviu F. Chibotaru | Zendy

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Spin-Vibronic Superexchange in Mott-Hubbard Fullerides

Author(s) -

Liviu F. Chibotaru

Publication year - 2005

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.94.186405

Subject(s) - superexchange , antiferromagnetism , vibronic coupling , condensed matter physics , spin (aerodynamics) , physics , ground state , degenerate energy levels , hubbard model , fullerene , atomic physics , excited state , quantum mechanics , superconductivity , thermodynamics

In the Mott-Hubbard cubic fulleride Li-3(NH3)(6)C-60 the superexchange energy is found to be much smaller than the rotational quantum for Jahn-Teller deformations at fullerene sites. This gives rise to a new type of superexchange interaction involving threefold degenerate vibronic ground states of C-60(3-) ions. In contrast with spin-orbital models, the spin-vibronic superexchange can be only antiferromagnetic and shows a significant vibronic reduction of the superexchange amplitude, in agreement with magnetic susceptibility data. As a function of the transfer parameters, two quadrupolar fully dynamical vibronic orders with quenched vibronic moments on sites develop in the ground state.status: publishe

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