Abstract
The competition between antiferromagnetic and spin-singlet ground states within quantumspin models and the -filled band Hubbard model has received intense scrutiny. Here we demonstrate afrustration-induced transition from Néel antiferromagnetism to a spin-singlet state in theinteracting -filled band on an anisotropic triangular lattice. While the antiferromagnetic state hasequal charge densities, 0.5, on all sites, the spin-singlet state is a paired-electroncrystal, with pairs of charge-rich sites separated by pairs of charge-poor sites. Thepaired-electron crystal provides a natural description of the spin-gapped state proximateto superconductivity in many organic charge transfer solids. Pressure-inducedsuperconductivity in these correlated-electron systems is likely a result of a transition fromthe -filled band valence bond solid to a valence bond liquid.
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