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• W2546831236 abstract "${mathrm{Ba}}_{3}{mathrm{BiRu}}_{2}{mathrm{O}}_{9}$ is a 6H-type perovskite compound containing face-sharing octahedral ${M}_{2}{mathrm{O}}_{9}$ ($M=mathrm{Ir}$, Ru) dimers, which are magnetically frustrated at low temperatures. On cooling through ${T}^{*}=176$ K, it undergoes a pronounced magnetostructural transition, which is not accompanied by any change in space group symmetry, long-range magnetic ordering, or charge ordering. Here, we report the first direct evidence from inelastic neutron scattering that this transition is due to an opening of a gap in the excitation spectra of dimers of low-spin ${mathrm{Ru}}^{4+}$ ($S=1$) ions. X-ray absorption spectroscopy reveals a change in Ru-Ru orbital overlap at ${T}^{*}$, linking the emergence of this spin-gap excitation to the magnetostructural transition. Ab initio calculations point to a geometrically frustrated magnetic ground state due to antiferromagnetic interdimer exchange on a triangular ${mathrm{Ru}}_{2}{mathrm{O}}_{9}$ dimer lattice. X-ray total-scattering data rule out long-range magnetic ordering at low temperatures, consistent with this geometrically frustrated model." @default.
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• W2546831236 date "2016-11-01" @default.
• W2546831236 modified "2023-10-09" @default.
• W2546831236 title "Experimental observation and computational study of the spin-gap excitation in Ba3BiRu2O9" @default.
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• W2546831236 doi "https://doi.org/10.1103/physrevb.94.174401" @default.
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