Order in a Spatially Anisotropic Triangular Antiferromagnet

Details Order in a Spatially Anisotropic Triangular Antiferromagnet Order in a Spatially Anisotropic Triangular Antiferromagnet

2011-08-15

arxiv.org/abs/1108.3036v3

Phys. Rev. B 84, 174415 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 7 figures, minor edits and reference added

Scientific paper

10.1103/PhysRevB.84.174415

The phase diagram of the spin-1/2 Heisenberg antiferromagnet on an anisotropic triangular lattice of weakly coupled chains, a model relevant to Cs2CuCl4, is investigated using a renormalization group analysis, which includes marginal couplings important for connecting to numerical studies of this model. In particular, the relative stability of incommensurate spiral spin-density order and collinear antiferromagnetic order is studied. While incommensurate spiral order is found to exist over most of the phase diagram in the presence of a Dzyaloshinskii-Moriya (DM) interaction, at small interchain and extremely weak DM couplings, collinear antiferromagnetic order can survive. Our results imply that Cs2CuCl4 is well within the part of the phase diagram where spiral order is stable. The implications of the renormalization group analysis for numerical studies, many of which have found spin-liquidlike behavior, are discussed.

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