Neutron powder diffraction experiments on multiferroic DyMnO 3

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dc.contributor.authorNarayanan, Nen_AU
dc.contributor.authorLi, Fen_AU
dc.contributor.authorHutchison, WDen_AU
dc.contributor.authorMulders, AMen_AU
dc.contributor.authorReynolds, Nen_AU
dc.contributor.authorRovillan, Pen_AU
dc.contributor.authorUlrich, Cen_AU
dc.contributor.authorHester, JRen_AU
dc.contributor.authorMcIntyre, GJen_AU
dc.date.accessioned2022-04-08T01:01:19Zen_AU
dc.date.available2022-04-08T01:01:19Zen_AU
dc.date.issued2012-11-15en_AU
dc.date.statistics2021-12-20en_AU
dc.description.abstractMultiferroic materials of particular interest are the frustrated magnetic compounds that exhibit a strongly coupled electric polarization (EP). One such compound is DyMnO{sub 3} which exists in an orthorhombic (o-DMO) and hexagonal modification depending on the synthesis conditions. In the present work the o-DMO is investigated by means of neutron powder diffraction focusing on the magnetic phase transitions and the behavior of the structural parameters in different magnetic and multiferroic phases. Below T{sub n,mn} =39 K, the Mn moments order sinusoidally with no EP. Then T{sub l=}16 K the Mn moments order in a spin spiral structure with an induced Dy moment and EP and finally below T{sub N,DY}=9 K a collinear ordering of the Dy moments takes place that reduces the EP significantly. Single phase samples are prepared via the solid state route and neutron diffraction (ND) experiments are carried out at the high flux ND beamline Wombat and at the high resolution ND beamline Echidna at OPAL. 0-DMO crystallizes in the space group Pbnm. All three magnetic phase transitions are identified and are in good agreement with. Below T{sub N,MN} an increased rotation of the rigid Mn06 octahedra in the ab plane, likely due to the competition between nearest neighbour aid next nearest neighbour superexchange interactions takes place. However below T{sub l} the MnO{sub 6} octahedra are significantly distorted along the c axis, the direction of the EP. Therefore the correlation between significant changes in the Mn-O bonds and the spontaneous EP are evident below T{sub l}. The reduction of EP below T{sub N.DY} on the other hand correlates with the rapid increase in the orbital ordering angle towards the 120° corresponding to the 3x{sup 2}-r{sup 2}/3y{sup 2}-r{sup 2} character of the orbitals.en_AU
dc.identifier.citationNarayanan, N., Li, F., Hutchison, W., Mulders, A. M., Reynolds, N., Rovillan, P., Ulrich, C., Hester, J., & McIntyre, G. (2012). Neutron powder diffraction experiments on multiferroic DyMnO 3. Presented at AINSE-ANBUG 2012: 10th Neutron Scattering Symposium (AANSS), Sydney, NSW (Australia), 7-9 Nov. 2012. In 10th AINSE-ANBUG Neutron Scattering Symposium (AANSS) 2012, (pp. 78).en_AU
dc.identifier.conferenceenddate9 November 2012en_AU
dc.identifier.conferencename10th AINSE-ANBUG Neutron Scattering Symposium (AANSS)en_AU
dc.identifier.conferenceplaceSydney, NSW, Australiaen_AU
dc.identifier.conferencestartdate7 November 2012en_AU
dc.identifier.pagination78en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12959en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineeringen_AU
dc.subjectSuperfluidityen_AU
dc.subjectSuperconductivityen_AU
dc.subjectCrystalsen_AU
dc.subjectFerromagnetic materialsen_AU
dc.subjectInteractionsen_AU
dc.subjectMagnetic propertiesen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectSpin glass stateen_AU
dc.titleNeutron powder diffraction experiments on multiferroic DyMnO 3en_AU
dc.typeConference Abstracten_AU
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