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- W1987576509 abstract "Neutron diffraction, magnetization, resistivity, and heat-capacity measurements on the 6H-perovskite Ba${}_{3}$BiRu${}_{2}$O${}_{9}$ reveal simultaneous magnetic and structural dimerization driven by strong magnetoelastic coupling. An isostructural but strongly displacive first-order transition on cooling through ${T}^{*}=176$ K is associated with a change in the nature of direct Ru--Ru bonds within Ru${}_{2}$O${}_{9}$ face-sharing octahedra. Above ${T}^{*}$, Ba${}_{3}$BiRu${}_{2}$O${}_{9}$ is an $S=1$ magnetic dimer system with intradimer exchange interactions ${J}_{0}/{k}_{mathrm{B}}=320$ K and interdimer exchange interactions ${J}^{ensuremath{'}}/{k}_{mathrm{B}}=ensuremath{-}160$ K. Below ${T}^{*}$, a spin-gapped state emerges with $ensuremath{Delta}ensuremath{approx}220$ K. Ab initio calculations confirm antiferromagnetic exchange within dimers, but the transition is not accompanied by long-range magnetic order." @default.
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- W1987576509 date "2011-12-15" @default.
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- W1987576509 title "Spin-gap opening accompanied by a strong magnetoelastic response in the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math>magnetic dimer system Ba<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>BiRu<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>…" @default.
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- W1987576509 doi "https://doi.org/10.1103/physrevb.84.220406" @default.
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