Ordering in spatially anisotropic triangular antiferromagnets
摘要
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.
引用
@article{arxiv.cond-mat/0607386,
title = {Ordering in spatially anisotropic triangular antiferromagnets},
author = {Oleg A. Starykh and Leon Balents},
journal= {arXiv preprint arXiv:cond-mat/0607386},
year = {2007}
}
备注
4 pages, 2 figures; v2: improved zero-field phase diagram, new figures