Giant magnetoelasticity at a spin gap transition in the 5d oxide Ba3Bilr2O9

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dc.contributor.authorLing, CDen_AU
dc.contributor.authorMiiller, Wen_AU
dc.contributor.authorKennedy, BJen_AU
dc.contributor.authorAvdeev, Men_AU
dc.date.accessioned2021-07-27T04:48:49Zen_AU
dc.date.available2021-07-27T04:48:49Zen_AU
dc.date.issued2013-12-03en_AU
dc.date.statistics2021-07-26en_AU
dc.descriptionHard copy held in ANSTO Library at DDC no. 539.758/15en_AU
dc.description.abstractThe 4d and 5d transition metals have much more diffuse valence orbitals than their 3rd (first-row) transition metals. Quantum cooperative phenomena that arise due to changes in the way these orbitals overlap and interact, such as magnetoelasticity, are therefore relatively rare in 4d and 5d compounds. However, we recently discovered a 6H-perovskite Ba_3Bilr_2O_9, containing 5d lr"4"+ (S = 1/2) dimerised into isolated face-sharing lr_2O_9 bi-octahedra, which exhibits a giant magnetoelastic effect - the largest of any known 5d compound - upon the opening a spin-gap at T* = 74 K. The first-order transition observed by neutron powder diffraction is characterised by a remarkable 4% increase in Ir-Ir distance and 1% negative thermal volume expansion. The transition is driven by a dramatic change in the interactions among Ir 5d orbitals, and represents a crossover between two very different, competing, ground states: one that optimises direct lr-lr bonding (at high temperature); and one that optimises lr-O-lr magnetic superexchange (at low temperature).en_AU
dc.identifier.citationLing, C. D., Miiller, W., Kennedy, B. J., & Avdeev, M. (2013). Giant magnetoelasticity at a spin gap transition in the 5d oxide Ba3Bilr2O9. Paper presented at 11th AINSE-ANBUG Neutron Scattering Symposium AANSS 2013 Sydney, NSW, Australia, 2-3 December.en_AU
dc.identifier.conferenceenddate3 December 2013en_AU
dc.identifier.conferencename11th AINSE-ANBUG Neutron Scattering Symposium AANSS 2013en_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate2 December 2013en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11103en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineeringen_AU
dc.subjectDimerizationen_AU
dc.subjectThermal expansionen_AU
dc.subjectTransition elementsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectSpinen_AU
dc.subjectPerovskiteen_AU
dc.subjectTemperature dependenceen_AU
dc.subjectMagnetic fieldsen_AU
dc.subjectElectronic structureen_AU
dc.subjectElectrical propertiesen_AU
dc.titleGiant magnetoelasticity at a spin gap transition in the 5d oxide Ba3Bilr2O9en_AU
dc.typeConference Abstracten_AU
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