Commensurate magnetic structures ofRMn2O5 (R=Y, Ho, Bi) determined by Single-crystal Neutron Diffraction

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dc.creatorChapon, C. Vecchini L. C.
dc.creatorBrown, P. J.
dc.creatorChatterji, T.
dc.creatorCheong, S. Park S-W.
dc.creatorRadaelli, P. G.
dc.date2007-10-10
dc.date.accessioned2026-07-07T08:35:30Z
dc.date.available2026-07-07T08:35:30Z
dc.descriptionPrecise magnetic structures of RMn2O5, with R= Y, Ho, Bi in the commensurate/ferroelectric regime, have been determined by single-crystal neutron diffraction. For each system, the integrated intensities of a large number of independent magnetic Bragg reflections have been measured, allowing unconstrained least-squares refinement of the structures. The analysis confirms the previously reported magnetic configuration in the ab-plane, in particular the existence of zig-zag antiferromagnetic chains. For the Y and Ho compounds additional weak magnetic components parallel to the c-axis were detected which are modulated in phase quadrature with the a-b components. This component is extremely small in the BiMn2O5 sample, therefore supporting symmetric exchange as the principal mechanism inducing ferroelectricity. For HoMn2O5, a magnetic ordering of the Ho moments was observed, which is consistent with a super-exchange interaction through the oxygens. For all three compounds, the point symmetry in the magnetically ordered state is m2m, allowing the polar b-axis found experimentally.
dc.identifierhttps://arxiv.org/abs/0710.2065
dc.identifierhttp://arxiv.org/abs/0710.2065
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/139768
dc.subjectMaterials Science
dc.titleCommensurate magnetic structures ofRMn2O5 (R=Y, Ho, Bi) determined by Single-crystal Neutron Diffraction
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