Finite size Spin Wave theory of the triangular Heisenberg model

Details Finite size Spin Wave theory of the triangular Heisenberg model Finite size Spin Wave theory of the triangular Heisenberg model

1999-09-17

arxiv.org/abs/cond-mat/9909268v1

Physical Review B 61, 11529 (2000)

Physics

Condensed Matter

Statistical Mechanics

6 pages (LateX), 2 ps-figures

Scientific paper

10.1103/PhysRevB.61.11529

We present a finite size spin wave calculation on the Heisenberg antiferromagnet on the triangular lattice focusing in particular on the low-energy part of the excitation spectrum. For s=1/2 the good agreement with the exact diagonalization and quantum Monte Carlo results supports the reliability of the spin wave expansion to describe the low-energy spin excitations of the Heisenberg model even in presence of frustration. This indicates that the spin susceptibility of the triangular antiferromagnet is very close to the linear spin wave result.

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