Generalized spin-density-wave state of the Hubbard model for C12 and C60 clusters.

  title={Generalized spin-density-wave state of the Hubbard model for C12 and C60 clusters.},
  author={Bergomi and Blaizot and Jolicoeur and Dagotto},
  journal={Physical review. B, Condensed matter},
  volume={47 9},
  • Bergomi, Blaizot, +1 author Dagotto
  • Published 14 October 1992
  • Physics, Medicine
  • Physical review. B, Condensed matter
The one-band Hubbard model at half filling on a truncated tetrahedron (C 12 ) and on the C 60 molecule is studied. Within the Hartree-Fock approximation, we find a magneticlike instability of the «Fermi sea» towards a spin-ordered phase for an intermediate value of the coupling (U/t) c ≃2.6. The ordered phase presents a spin arrangement similar to that of the classical Heisenberg model defined on the same clusters. We study the linear excitations around the Hartree-Fock ground states using the… 

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