Heisenberg antiferromagnet on the square lattice for S>=1

Abstract

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.

4 pages RevTeX file with 5 figures included by psfig

References in corpus (3)

• Asymptotic scaling of the square lattice quantum Heisenberg antiferromagnet
• The Square-Lattice Heisenberg Antiferromagnet at Very Large Correlation Lengths
• The Two-Dimensional S=1 Quantum Heisenberg Antiferromagnet at Finite Temperatures

Cited by in corpus (6)

• The importance of XY anisotropy in Sr2IrO4 revealed by magnetic critical scattering experiments
• Thermodynamics of the quantum easy-plane antiferromagnet on the triangular lattice
• Reconciling the correlation length for high-spin Heisenberg antiferromagnets
• The quantum Heisenberg antiferromagnet on the square lattice
• Effective Hamiltonian with holomorphic variables
• Quantum Heisenberg antiferromagnets: a survey of the activity in Firenze