Effects of 18O isotope substitution in multiferroic RMnO3 (R = Tb, Dy)

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dc.contributor.authorGraham, PJen_AU
dc.contributor.authorNarayanan, Nen_AU
dc.contributor.authorMcIntyre, GJen_AU
dc.contributor.authorHutchison, WDen_AU
dc.contributor.authorUlrich, Cen_AU
dc.contributor.authorReynolds, Nen_AU
dc.contributor.authorRovillain, Pen_AU
dc.contributor.authorHester, JRen_AU
dc.contributor.authorKimpton, JAen_AU
dc.contributor.authorYethiraj, Men_AU
dc.contributor.authorPomjakushina, Een_AU
dc.contributor.authorCondor, Ken_AU
dc.contributor.authorKenzelmann, Men_AU
dc.date.accessioned2021-12-15T00:26:30Zen_AU
dc.date.available2021-12-15T00:26:30Zen_AU
dc.date.issued2016-02-05en_AU
dc.date.statistics2021-09-23en_AU
dc.description.abstractMultiferroic materials demonstrate desirable attributes for next-generation multifunctional devices as they exhibit coexisting ferroelectric and magnetic orders. In type-II multiferroics, coupling exists that allows ferroelectricity to be manipulated via magnetic order and vice versa, offering potential in high-density information storage and sensor applications. Despite extensive investigations into the subject, questions of the physics of magnetoelectric coupling in multiferroics remain, and competing theories propose different mechanisms. The aim of this investigation was to study changes in the statics and dynamics of structural, ferroelectric and magnetic orders with oxygen-18 isotope substitution to shine light into the coupling mechanism in multiferroic RMnO3 (R=Tb, Dy) systems. We have performed Raman spectroscopy on 16O and 18O-substituted TbMnO3 single crystals. Oxygen-18 isotope substitution reduces all phonon frequencies significantly. However, specific heat measurements determine no changes in Mn3+ (28 and 41 K) magnetic phase transition temperatures. Pronounced anomalies in peak position and linewidth at the magnetic and ferroelectric phase transitions. While the anomalies at the sinusoidal magnetic phase transition (41 K) are in accordance to the theory of spin-phonon coupling, further deviations develop upon entering the ferroelectric phase (28 K). Furthermore, neutron diffraction measurements on 16O and 18O-substituted DyMnO3 powders show structural deviations at the ferroelectric phase transition (17 K) in the order of 100 fm in the b direction. The Pbnm space group is centrosymmetric and therefore does not allow ferroelectricity via atomic displacements, however our Reitveld analysis for the subgroup P21 shows significant displacements and polarisation along b that is comparable to the experimental value, making it the most promising candidate for ionic displacement induced polarisation in DyMnO3. These combined results demonstrate that structure is an important consideration in the emergence of ferroelectricity in these materials.en_AU
dc.identifier.citationGraham, P., Narayanan, N., McIntyre, G., Hutchinson, W., Ulrich, C., Reynolds, N., Rovillain, P., Hester, J., Kimpton, J., Yethiraj, M., Pomjakushina, E., Conder, K., & Kenzelmann, M. (2016). Effects of 18O isotope substitution in multiferroic RMnO3 (R=Tb, Dy). Paper presented to the 40th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 2nd February – 5th February, 2016, (pp. 60). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2016/Wagga_2016_Conference_Handbook.pdfen_AU
dc.identifier.conferenceenddate5 February 2016en_AU
dc.identifier.conferencename40th Annual Condensed Matter and Materials Meetingen_AU
dc.identifier.conferenceplaceWagga Wagga, New South Walesen_AU
dc.identifier.conferencestartdate2 February 2016en_AU
dc.identifier.isbn978-0-646-96433-1en_AU
dc.identifier.otherFM3en_AU
dc.identifier.pagination60en_AU
dc.identifier.urihttps://physics.org.au/wp-content/uploads/cmm/2016/Wagga_2016_Conference_Handbook.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12456en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectCouplingen_AU
dc.subjectCrystal structureen_AU
dc.subjectElectric propertiesen_AU
dc.subjectMagnetic fieldsen_AU
dc.subjectManganese oxidesen_AU
dc.subjectMemory devicesen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectOxygen isotopesen_AU
dc.subjectPhase transformationsen_AU
dc.subjectRaman spectroscopyen_AU
dc.subjectSensorsen_AU
dc.titleEffects of 18O isotope substitution in multiferroic RMnO3 (R = Tb, Dy)en_AU
dc.typeConference Abstracten_AU
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