Giant magnetoelastic effect at the opening of a spin-gap in Ba3BiIr2O9

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dc.contributor.authorMiiller, Wen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorZhou, Qen_AU
dc.contributor.authorKennedy, BJen_AU
dc.contributor.authorSharma, Nen_AU
dc.contributor.authorKutteh, Ren_AU
dc.contributor.authorKearley, GJen_AU
dc.contributor.authorSchmid, Sen_AU
dc.contributor.authorKnight, KSen_AU
dc.contributor.authorBlanchard, PERen_AU
dc.contributor.authorLing, CDen_AU
dc.date.accessioned2021-01-04T04:08:56Zen_AU
dc.date.available2021-01-04T04:08:56Zen_AU
dc.date.issued2012-01-26en_AU
dc.date.statistics2021-01-04en_AU
dc.description.abstractAs compared to 3d (first-row) transition metals, the 4d and 5d transition metals have much more diffuse valence orbitals. Quantum cooperative phenomena that arise due to changes in the way these orbitals overlap and interact, such as magnetoelasticity, are correspondingly rare in 4d and 5d compounds. Here, we show that the 6H-perovskite Ba3BiIr2O9, which contains 5d Ir4+ (S = 1/2) dimerized into isolated face-sharing Ir2O9 bioctahedra, exhibits a giant magnetoelastic effect, the largest of any known 5d compound, associated with the opening of a spin-gap at T* = 74 K. The resulting first-order transition is characterized 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 optimizes direct Ir–Ir bonding (at high temperature), and one that optimizes Ir–O–Ir magnetic superexchange (at low temperature). © 2012 American Chemical Societyen_AU
dc.identifier.citationMiiller, W., Avdeev, M., Zhou, Q., Kennedy, B. J., Sharma, N., Kutteh, R., Kearley, G. J., Schmid, S., Knight, K. S., Blanchard, P. E. R., & Ling, C. D. (2012). Giant magnetoelastic effect at the opening of a spin-gap in Ba3BiIr2O9. Journal of the American Chemical Society, 134(6), 3265–3270. doi:10.1021/ja211517hen_AU
dc.identifier.issn0002-7863en_AU
dc.identifier.issue6en_AU
dc.identifier.journaltitleJournal of the American Chemical Societyen_AU
dc.identifier.pagination3265-3270en_AU
dc.identifier.urihttps://doi.org/10.1021/ja211517hen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10171en_AU
dc.identifier.volume134en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectPhase transformationsen_AU
dc.subjectTransition elementsen_AU
dc.subjectCrystal latticesen_AU
dc.subjectQuantum mechanicsen_AU
dc.subjectPerovskiteen_AU
dc.subjectSpinen_AU
dc.titleGiant magnetoelastic effect at the opening of a spin-gap in Ba3BiIr2O9en_AU
dc.typeJournal Articleen_AU
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