Magnetic properties of the two-dimensional Heisenberg model on a triangular lattice

Details Magnetic properties of the two-dimensional Heisenberg model on a triangular lattice Magnetic properties of the two-dimensional Heisenberg model on a triangular lattice

2004-10-19

arxiv.org/abs/cond-mat/0410468v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures

Scientific paper

10.1016/j.physleta.2004.11.028

The spin Green's function of the antiferromagnetic Heisenberg model on a triangular lattice is calculated using Mori's projection operator technique. At T=0 the spin excitation spectrum is shown to have gaps at the wave vectors of the classical Neel ordering. This points to the absence of the antiferromagnetic long-range order in the ground state. The calculated spin correlation on the neighboring sites of the same sublattice is in good agreement with the value derived from exact diagonalization. The temperature dependencies of the spin correlations and the gaps are calculated.

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