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Previous studies have found that calculations which consider long-rangemagnetic dipolar interactions truncated at a finite cut-off distance Rc predictspurious (unphysical) long-range ordered phases for Ising and Heisenbergsystems on the pyrochlore lattice. In this paper we show that, similar to thesetwo cases, calculations that use truncated dipolar interactions to model theGd3Ga5O12 garnet antiferromagnet also predict unphysical phases withincommensurate ordering wave vector q_ord that is very sensitive to the dipolarcut-off distance Rc.Comment: 7 pages, 2 color figures; Proceedings of the HFM2006 conference, to  appear in a special issue of J. Phys.: Condens. Matte

journal of physics. condensed matter

Ill-behaved convergence of a model of the Gd3Ga5O12garnet antiferromagnet with truncated magnetic dipole–dipole interactions