Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-08-27
J. Phys.: Condens. Matter 22, 272201 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, 4 figures. Revised version to appear in J. Phys.: Condens. Matter
Scientific paper
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 N\'{e}el antiferromagnetism to spin-singlet 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 transition from the 1/4-filled band valence bond solid to a valence bond liquid.
Clay Torsten R.
Li Handong
Mazumdar Subham
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