Abstract
The question of long-range order in two-dimensional isotropic dipolar Heisenberg antiferromagnets on a honeycomb lattice is studied. The excitation spectrum is evaluated, yielding via linear spin-wave theory a non vanishing order parameter at finite temperatures. The Néel temperature is calculated by the Green function method of Callen. For MnPS 3, a quasi two-dimensional antiferromagnet, good agreement with the measured transition temperature is obtained. In addition it is shown that the dipolar interaction leads to an intermediate phase ( T = 0) when an external magnetic field is applied.
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