Journal
PHYSICAL REVIEW B
Volume 81, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.245121
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Funding
- NSF [DMR-0705255, DMR-0804040]
- DOE [DE-FG02-07ER46423]
- U.S. Department of Energy (DOE) [DE-FG02-07ER46423] Funding Source: U.S. Department of Energy (DOE)
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We study the energetics of Gutzwiller projected BCS states of various symmetries for the triangular lattice antiferromagnet with a four-particle ring exchange using variational Monte Carlo methods. In a range of parameters the energetically favored state is found to be a projected d(x2-y2) paired state which breaks lattice rotational symmetry. We show that the properties of this nematic or orientationally ordered paired spin-liquid state as a function of temperature and pressure can account for many of the experiments on organic materials. We also study the ring-exchange model with ferromagnetic Heisenberg exchange and find that among the studied ansatze, a projected f-wave state is the most favorable.
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