1995/09/13 by Rajiv R. P. Singh, Martin P. Gelfand · 1 citation
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1103/physrevb.52.r15695
Two postscript figures, 4 two-column pages
arxiv created 1995/09/13 · arxiv updated 2009/11/30
Using a recently developed method for calculating series expansions of the excitation spectra of quantum lattice models, we obtain the spin-wave spectra for square lattice, S=1/2 Heisenberg-Ising antiferromagnets. The calculated spin-wave spectrum for the Heisenberg model is close to but noticeably different from a uniformly renormalized classical (large-S) spectrum with the renormalization for the spin-wave velocity of approximately 1.18. The relative weights of the single-magnon and multi-magnon contributions to neutron scattering spectra are obtained for wavevectors throughout the Brillouin zone.