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

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

2009-10-14

arxiv.org/abs/0910.2728v1

Physica B 405, S253 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

submitted to Physica B special issue for ISCOM 2009

Scientific paper

10.1016/j.physb.2009.11.091

We describe the Paired Electron Crystal (PEC) which occurs in the interacting frustrated two-dimensional 1/4-filled band. The PEC is a charge-ordered state with nearest-neighbor spin singlets separated by pairs of vacant sites, and can be thought of as a bipolaron density wave. The PEC has been experimentally observed in the insulating state proximate to superconductivity in the organic charge-transfer solids. Increased frustration drives a PEC-to-superconductor transition in these systems.

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