Pauli susceptibility of A3C60 (A=K, Rb)
F. Aryasetiawan, O. Gunnarsson, E. Koch, R.M. Martin, (Max-Planck-Institut f\"ur Festk\"orperforschung, Stuttgart, Germany), (Department of Physics, University of Lund, Sweden) (Department of Physics,, University of Illinios, Urbana)
TL;DR
This paper calculates the Pauli susceptibility of A3C60 compounds using a lattice quantum Monte Carlo method, revealing a significant many-body enhancement that aligns different density of states estimates.
Contribution
It applies a multi-band Hubbard model with quantum Monte Carlo to quantify many-body effects in the susceptibility of doped fullerenes.
Findings
Susceptibility is enhanced by a factor of three due to many-body effects.
Reconciles susceptibility-based and other density of states estimates.
Highlights substantial many-body phenomena in doped fullerenes.
Abstract
The Pauli paramagnetic susceptibility of A3C60 (A= K, Rb) compounds is calculated. A lattice quantum Monte Carlo method is applied to a multi-band Hubbard model, including the on-site Coulomb interaction U. It is found that the many-body enhancement of the susceptibility is of the order of a factor of three. This reconciles estimates of the density of states from the susceptibility with other estimates. The enhancement is an example of a substantial many-body effect in the doped fullerenes.
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