Temperature behavior of the magnon modes of the square lattice antiferromagnet

Details Temperature behavior of the magnon modes of the square lattice antiferromagnet Temperature behavior of the magnon modes of the square lattice antiferromagnet

1999-05-24

arxiv.org/abs/cond-mat/9905340v1

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 2 figures

Scientific paper

10.1103/PhysRevB.60.10180

A spin-wave theory of short-range order in the square lattice Heisenberg antiferromagnet is formulated. With growing temperature from T=0 a gapless mode is shown to arise simultaneously with opening a gap in the conventional spin-wave mode. The spectral intensity is redistributed from the latter mode to the former. For low temperatures the theory reproduces results of the modified spin-wave theory by M.Takahashi, J.E.Hirsch et al. and without fitting parameters gives values of observables in good agreement with Monte Carlo results in the temperature range 0 <= T < 0.8J where J is the exchange constant.

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