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We describe the Paired Electron Crystal (PEC) which occurs in the interactingfrustrated two-dimensional 1/4-filled band. The PEC is a charge-ordered statewith nearest-neighbor spin singlets separated by pairs of vacant sites, and canbe thought of as a bipolaron density wave. The PEC has been experimentallyobserved in the insulating state proximate to superconductivity in the organiccharge-transfer solids. Increased frustration drives a PEC-to-superconductortransition in these systems.

Bipolaron Density-Wave Driven By Antiferromagnetic Correlations and Frustration in Organic Superconductors