Physics – Condensed Matter – Superconductivity
Scientific paper
2012-03-12
Phys. Rev. B 85, 144420 (2012)
Physics
Condensed Matter
Superconductivity
10 figures, minor editorial changes in the published version
Scientific paper
Higher order quantum effects on the magnetic phase diagram induced by four-spin ring exchange on plaquettes are investigated for a two-dimensional quantum antiferromagnet with S=1/2. Spatial anisotropy and frustration are allowed for. Using a perturbative spin-wave expansion up to second order in 1/S we obtain the spin-wave energy dispersion, sublattice magnetization, and the magnetic phase diagram. We find that for substantial four-spin ring exchange the quantum fluctuations are stronger than in the standard Heisenberg model. A moderate amount of four-spin ring exchange couplings stabilizes the ordered antiferromagnetic Neel state while a large amount renders it unstable. Comparison with inelastic neutron scattering data points toward a moderate ring exchange coupling of 27% to 29% of the nearest-neighbor exchange coupling.
Furton Douglas
Majumdar Kingshuk
Uhrig Goetz S.
No associations
LandOfFree
Effects of ring exchange interaction on the Neel phase of two-dimensional, spatially anisotropic, frustrated Heisenberg quantum antiferromagnet does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effects of ring exchange interaction on the Neel phase of two-dimensional, spatially anisotropic, frustrated Heisenberg quantum antiferromagnet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effects of ring exchange interaction on the Neel phase of two-dimensional, spatially anisotropic, frustrated Heisenberg quantum antiferromagnet will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-489257