Multiphase region of helimagnetic superlattices at low temperature in an extended six-state clock model

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dc.creatorLovelady, D. C.
dc.creatorHarper, H. M.
dc.creatorBrodsky, I. E.
dc.creatorRabson, D. A.
dc.date2006-01-02
dc.date2006-05-12
dc.date.accessioned2026-07-07T06:57:17Z
dc.date.available2026-07-07T06:57:17Z
dc.descriptionThe variety of magnetic phases observed in rare-earth heterostructures at low temperatures \cite{Jehan}, such as Ho/Y, may be elucidated by an ANNNI-like model Hamiltonian. In previous work modelling bulk Ho \cite{Seno}, such a Hamiltonian with a one-dimensional parameter space produced a single multiphase point. In contrast, the parameter space of the heterostructure model is three-dimensional, and instead of an isolated multiphase point, we find two-dimensional multiphase regions. In an example of Villain's ``order from disorder'' \cite{Villain80a,Villain91}, an infinitesimal temperature breaks the ground-state degeneracy. In first order of a low-temperature expansion, we find that the degeneracy is broken everywhere in a multiphase region except on a line. A segment of the line appears to remain multiphase to all orders in a low-temperature expansion when the number $L$ of magnetic layers between non-magnetic spacers is 4 but not for other values of $L$. For L=4, the hierarchy of phases more closely resembles that in the ANNNI model than in the bulk six-state clock model on which the present model is based.
dc.descriptionLatex, 16 pages, 3 figures Revision: expanded appendix and discussion of implications; new figures; now published
dc.identifierhttps://arxiv.org/abs/cond-mat/0601033
dc.identifierhttp://arxiv.org/abs/cond-mat/0601033
dc.identifierJ. Phys. A, 39 (2006) 5681-5694
dc.identifierdoi:10.1088/0305-4470/39/20/004
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/106917
dc.subjectStatistical Mechanics
dc.subjectMaterials Science
dc.titleMultiphase region of helimagnetic superlattices at low temperature in an extended six-state clock model
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