Critical phenomena in a highly constrained classical spin system: Neel ordering from the Coulomb phase

Autor:	Pickles, T. S., Saunders, T. E., Chalker, J. T.
Rok vydání:	2007
Předmět:	Condensed Matter - Statistical Mechanics Condensed Matter - Strongly Correlated Electrons
Zdroj:	Europhysics Letters 84 36002 (2008)
Druh dokumentu:	Working Paper
DOI:	10.1209/0295-5075/84/36002
Popis:	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 that it 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. Comment: 4 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0708.3791 Zobrazit plný text záznamu View this record from Arxiv