Neutron diffraction study of the magnetic structure of Na2RuO4

Mogare, Kailash; Sheptyakov, Denis; Bircher, Roland; Güdel, Hans-Ulrich; Jansen, Martin (2006). Neutron diffraction study of the magnetic structure of Na2RuO4. European physical journal. B - condensed matter and complex systems, 52(3), pp. 371-376. Les Ulis (F): EDP Sciences 10.1140/epjb/e2006-00316-5

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Nuclear and magnetic structures of sodium ruthenate (VI) have been studied by neutron powder diffraction in the temperature range 1.5–200 K. Na2RuO4 crystallizes in the monoclinic structure, with space group P 21/c. The structure consists of apical corner sharing RuO5 trigonal bipyramids forming infinite chains running along the b axis. These infinite [ RuO3O2/2] chains form a pseudo hexagonal close packing of rods with Ru–Ru distances of 3.51 Å within the chains and 5.30–5.47 Å between the chains. At TN=37.2 K a magnetic transition leads to an antiferromagnetic state. The Ru6+ magnetic moments are ordered antiferromagnetically along the chains (b-axis), while the inter-chain interaction is ferromagnetic. A classical infinite chain model was fitted to the magnetic susceptibility data in order to estimate the strength of the nearest-neighbor exchange interactions along and between the chains, resulting in an intrachain coupling parameter of 2J=-86 K, and an interchain parameter J⊥ with |2J⊥ | = 3 K.

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