Journal
EPL
Volume 84, Issue 3, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1209/0295-5075/84/36002
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Funding
- EPSRC [GR/R83712/01]
- NSF [PHY99-07949]
- Engineering and Physical Sciences Research Council [GR/R83712/01] Funding Source: researchfish
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Many classical, geometrically frustrated antiferromagnets have macroscopically degenerate ground states. In a class of three-dimensional systems, the set of degenerate ground states has power law correlations and is an example of a Coulomb phase. We investigate Neel ordering from such a Coulomb phase, induced by weak additional interactions that lift the degeneracy. We show that the critical point belongs to a universality class that is different from the one for the equivalent transition out of the paramagnetic phase, and instead that this transition is characterised by effective long-range interactions; alternatively, ordering may be discontinuous. We suggest that a transition of this type may be realised by applying uniaxial stress to a pyrochlore antiferromagnet. Copyright (C) EPLA, 2008
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