Heisenberg antiferromagnet on the square lattice for S>=1

Details Heisenberg antiferromagnet on the square lattice for S>=1 Heisenberg antiferromagnet on the square lattice for S>=1

1998-04-22

arxiv.org/abs/cond-mat/9804245v1

Phys. Rev. B 58, 14151 (1998)

Physics

Condensed Matter

4 pages RevTeX file with 5 figures included by psfig

Scientific paper

10.1103/PhysRevB.58.14151

Theoretical predictions of a semiclassical method - the pure-quantum self-consistent harmonic approximation - for the correlation length and staggered susceptibility of the Heisenberg antiferromagnet on the square lattice (2DQHAF) agree very well with recent quantum Monte Carlo data for S=1, as well as with experimental data for the S=5/2 compounds Rb2MnF4 and KFeF4. The theory is parameter-free and can be used to estimate the exchange coupling: for KFeF4 we find J=2.33 +- 0.33 meV, matching with previous determinations. On this basis, the adequacy of the quantum nonlinear sigma model approach in describing the 2DQHAF when S>=1 is discussed.

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