The correlation length of the Heisenberg antiferromagnet with arbitrary spin S

Ground-state properties of the triangular-lattice Heisenberg antiferromagnet with arbitrary spin quantum number s

We apply the coupled cluster method to high orders of approximation and exact diagonalizations to study the ground-state properties of the triangular-lattice spin-s Heisenberg antiferromagnet. We calculate the fundamental ground-state quantities, namely, the energy e0, the sublattice magnetization Msub, the in-plane spin stiffness ρs and the in-plane magnetic susceptibility χ for spin quantum n...

The Spin-Wave Continuum of the S = 1/2 Linear Heisenberg Antiferromagnet

Spin‐Wave Damping and Hydrodynamics in the Heisenberg Antiferromagnet

The Dyson‐Maleev formalism is used to calculate the decay rate of antiferromagnetic spin waves at low temperatures and long wavelengths. Various regimes must be distinguished depending on the relation between the wavevector k, the temperature T, and the anisotropy energy. For the isotropic system the relevant parameters are (a) the incident energy, (b) the thermal energy, (c) the deviation from...

Spin excitations and sum rules in the Heisenberg antiferromagnet.

Various bounds for the energy of collective excitations in the Heisenberg antiferromagnet are presented and discussed using the formalism of sum rules. We show that the Feynman approximation significantly overestimates (by about 30% in the S = 1 2 square lattice) the spin velocity due to the non negligible contribution of multi magnons to the energy weighted sum rule. We also discuss a differen...

Multilayer S 5 12 Heisenberg antiferromagnet

The multilayer S5 1 2 square lattice Heisenberg antiferromagnet with up to six layers is studied using various series expansions. For systems with an odd number of coupled planes, the ground-state energy, staggered magnetization, and triplet excitation spectra are calculated using two different Ising expansions. The systems are found to have long-range Néel order and gapless excitations for all...