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Spin-lozenge thermodynamics and magnetic excitations in Na3RuO4

We report inelastic and elastic neutron scattering, magnetic susceptibility, and heat capacity measurements for polycrystalline sodium ruthenate (Na3RuO4). Previous work suggests that this material consists of isolated tetramers of S = 3/2 Ru5+ ions in a so-called lozenge configuration. Comparisons of magnetic susceptibility and inelastic and elastic neutron scattering results with analytic calculations for several cluster models show that although there may be significant spin–spin correlations within the lozenge cluster, a simple isolated lozenge model is not appropriate for Na3RuO4.