Abstract
Theoretical predictions of a semiclassical method—the pure-quantum self-consistent harmonic approximation—for the correlation length and staggered susceptibility of the two-dimensional quantum Heisenberg antiferromagnet (2DQHAF) on the square lattice agree very well with recent quantum Monte Carlo data for as well as with experimental data for the compounds and The theory is parameter free and can be used to estimate the exchange coupling: for we find meV, consistent with previously determined values. On this basis, the adequacy of the quantum nonlinear model approach in describing the 2DQHAF when is discussed.
- Received 8 April 1998
DOI:https://doi.org/10.1103/PhysRevB.58.14151
©1998 American Physical Society