Ordering in spatially anisotropic triangular antiferromagnets

Abstract

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.

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

References in corpus (4)

• Anisotropic pyrochlores and the global phase diagram of the checkerboard antiferromagnet
• Ground states of a frustrated spin-1/2 antifferomagnet: Cs_2CuCl_4 in a magnetic field
• Spin dynamics of the quasi two dimensional spin-1/2 quantum magnet Cs_2CuCl_4
• Spin Structure Factor of the Frustrated Quantum Magnet Cs_2CuCl_4

Cited by in corpus (10)

• Spinons and triplons in spatially anisotropic frustrated antiferromagnets
• Quantum stabilization of 1/3-magnetization plateau in Cs_2CuBr_4
• Global phase diagrams of frustrated quantum antiferromagnets in two dimensions: doubled Chern-Simons theory
• Spatially Anisotropic Heisenberg Kagome Antiferromagnet
• Thermodynamics of the Up-Up-Down Phase of the S = 1/2 Triangular-Lattice Antiferromagnet Cs${}_2$CuBr${}_4$
• Magnetic order in coupled spin-half and spin-one Heisenberg chains in anisotropic triangular-lattice geometry
• Excitation spectra and ground state properties of the layered spin-1/2 frustrated antiferromagnets Cs_2CuCl_4 and Cs_2CuBr_4
• Heisenberg antiferromagnet with anisotropic exchange on the Kagome lattice: Description of the magnetic properties of volborthite
• Quasiparticles of spatially anisotropic triangular antiferromagnets in a magnetic field
• Reduced dimensionality in layered quantum dimer magnets: Frustration vs. inhomogeneous condensates