Ordering in spatially anisotropic triangular antiferromagnets

Details Ordering in spatially anisotropic triangular antiferromagnets Ordering in spatially anisotropic triangular antiferromagnets

2006-07-14

arxiv.org/abs/cond-mat/0607386v2

Phys. Rev. Lett. 98, 077205 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures; v2: improved zero-field phase diagram, new figures

Scientific paper

10.1103/PhysRevLett.98.077205

We investigate the phase diagram of the anisotropic spin-1/2 triangular lattice antiferromagnet, with interchain diagonal exchange J' much weaker than the intrachain exchange J. We find that fluctuations lead to a competition between (commensurate) collinear antiferromagnetic and (zig-zag) dimer orders. Both states differ in symmetry from the spiral order known to occur for larger J', and are therefore separated by quantum phase transitions from it. The zero-field collinear antiferromagnet is succeeded in a magnetic field by magnetically-ordered spin-density-wave and cone phases, before reaching the fully polarized state. Implications for the anisotropic triangular magnet Cs_2CuCl_4 are discussed.

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