Quantum Monte Carlo calculations for integer-doped Fullerides

Details Quantum Monte Carlo calculations for integer-doped Fullerides Quantum Monte Carlo calculations for integer-doped Fullerides

1998-04-06

arxiv.org/abs/cond-mat/9804059v1

Proceedings of the IWEPNM97: Molecular Nanostructures, Eds. H. Kuzmany, J. Fink, M. Mehring, S. Roth, World Scientific, 1998,

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages LaTeX, 2 eps figures included; additional information available at http://www.mpi-stuttgart.mpg.de/docs/ANDERSEN/fulle

Scientific paper

The doped Fullerides can be well described by a Hubbard model, which comprises the partly filled, threefold-degenerate t_1u orbital and the on-site Coulomb interaction U. The orbital degeneracy is known to shift the critical ratio U_c/W for the Mott-Hubbard transition towards larger values. This puts the half-filled alkali-doped Fullerides A_3 C_60 on the metallic side of the transition. Prompted by the recent synthesis of isostructural families of integer-doped Fullerides with different fillings, we investigate how the orbital degeneracy affects the Mott transition at integer fillings different from 3. The calculations are done by fixed-node diffusion Monte Carlo, using a trial function, which permits us to systematically vary the magnetic character of the system.

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