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Spin-gap opening accompanied by a strong magnetoelastic response in the S=1 magnetic dimer system Ba3BiRu2O9

Neutron diffraction, magnetization, resistivity, and heat capacity measurements on the 6H-perovskite Ba3BiRu2O9 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 Ru2O9 face-sharing octahedra. Above T*, Ba3BiRu2O9 is an S=1 magnetic dimer system with intradimer exchange interactions J0/kB=320 K and interdimer exchange interactions J'/kB=-160 K. Below T*, a spin-gapped state emerges with Δ\approx220 K. Ab initio calculations confirm antiferromagnetic exchange within dimers, but the transition is not accompanied by long range-magnetic order.

preprint2011arXivOpen access
Wojciech MiillerMaxim AvdeevQingdi ZhouAndrew J. StuderBrendan J. KennedyGordon J. KearleyChris D. Ling
cond-mat.str-el
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Wojciech MiillerMaxim AvdeevQingdi ZhouAndrew J. StuderBrendan J. KennedyGordon J. KearleyChris D. Ling

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