Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 22, Issue 27, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/22/27/272201
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Funding
- US Department of Energy [DE-FG02-06ER46315]
- U.S. Department of Energy (DOE) [DE-FG02-06ER46315] Funding Source: U.S. Department of Energy (DOE)
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The competition between antiferromagnetic and spin-singlet ground states within quantum spin models and the 1/2-filled band Hubbard model has received intense scrutiny. Here we demonstrate a frustration-induced transition from Neel antiferromagnetism to a spin-singlet state in the interacting 1/4-filled band on an anisotropic triangular lattice. While the antiferromagnetic state has equal charge densities, 0.5, on all sites, the spin-singlet state is a paired-electron crystal, with pairs of charge-rich sites separated by pairs of charge-poor sites. The paired-electron crystal provides a natural description of the spin-gapped state proximate to superconductivity in many organic charge transfer solids. Pressure-induced superconductivity in these correlated-electron systems is likely a result of a transition from the 1/4-filled band valence bond solid to a valence bond liquid.
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