Abstract
Transverse susceptibility (), spin stiffness constant (), spin-wave velocity (), staggered magnetization () and the ground-state energy () of the T=0, spin-(1/2 square-lattice Heisenberg antiferromagnet are estimated by expansions around the Ising limit. Extrapolations of the series, which take into account the leading singular behavior, give (=8J)=0.52±0.03, &(=4/J)=0.72 &(=/ √2 J)=1.18±0.02, 2=0.605±0.015, and 4/J=-2.6785±0.0010. The extrapolations are aided by universal amplitude ratios, whose values can be obtained exactly from the spin-wave theory.
- Received 15 February 1989
DOI:https://doi.org/10.1103/PhysRevB.39.9760
©1989 American Physical Society