Order of Two-Dimensional Isotropic Dipolar Antiferromagnets
C. Pich, F. Schwabl
Abstract
The question of the existence of order in two-dimensional isotropic dipolar Heisenberg antiferromagnets is studied. It is shown that the dipolar interaction leads to a gap in the spin-wave energy and a nonvanishing order parameter. The resulting finite Néel-temperature is calculated for a square lattice by means of linear spin-wave theory.
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