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dc.contributor.authorChern, G.-W.
dc.contributor.authorMoessner, R.
dc.contributor.authorTchernyshyov, O.
dc.date.accessioned2009-12-29T18:17:25Z
dc.date.available2009-12-29T18:17:25Z
dc.date.issued2008-10-01
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics) 1 Oct. 2008, vol.78, no.14, 144418 (14 pp.)en_US
dc.identifier.urihttp://jhir.library.jhu.edu/handle/1774.2/33730
dc.description.abstractWe investigate theoretically the phase diagram of a classical Heisenberg antiferromagnet on the pyrochlore lattice perturbed by a weak second-neighbor interaction J2. The huge ground-state degeneracy of the nearest-neighbor Heisenberg spins is lifted by J2 and a magnetically ordered ground state sets in upon approaching zero temperature. We have found a new, partially ordered phase with collinear spins at finite temperatures for a ferromagnetic J2. In addition to a large nematic order parameter, this intermediate phase also exhibits a layered structure and a bond order that breaks the sublattice symmetry. Thermodynamic phase boundaries separating it from the fully disordered and magnetically ordered states scale as 1.87J2S2 and 0.26J2S2 in the limit of small J2. The phase transitions are discontinuous. We analytically examine the local stability of the collinear state and obtain a boundary T~J22/J1 in agreement with Monte Carlo simulations.en_US
dc.language.isoen_USen_US
dc.publisherAmerican Physical Societyen_US
dc.subjectorder-disorder transformationsen_US
dc.subjectmagnetic transitionsen_US
dc.subjectantiferromagnetic materialsen_US
dc.subjectclassical Heisenberg antiferromagneten_US
dc.subjectpyrochlore latticen_US
dc.subjectground state degeneracyen_US
dc.subjectnearest-neighbor Heisenberg spinsen_US
dc.subjectmagnetically ordered ground stateen_US
dc.subjectferromagnetismen_US
dc.subjectnematic order parameteren_US
dc.subjectthermodynamic phase boundarieen_US
dc.subjectMonte Carlo simulationsen_US
dc.titlePartial order from disorder in a classical pyrochlore antiferromagneten_US
dc.typeArticleen_US


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