International audienceBarium ruthenate Ba4Ru3O10, in which Ru3O12 trimers are connected together to form a checkered twodimensional framework, has been synthesized and its structural, magnetic, and transport properties studied between 300 and 2 K. The paramagnetic to antiferromagnetic transition at TN ≈ 105 K evidenced on the susceptibility curve coincides with an increase of electron localization in transportmeasurements. Thermoelectric power and Hall coefficientmeasurements both exhibit dramatic changes at TN, characteristic of a reconstruction of the bands structure near the Fermi level. No pronounced structural changes are observed at TN in this compound. The magnetic scattering signal on the neutron powder diffraction patterns below TN is weak but can be tentatively modeled with an antiferromagnetic ordering of the spins at both ends of a trimer, the spin of the more symmetric Ru site remaining idle. Crystal field and strong spin-orbit coupling at the Ru4+ site seem to be the key parameters to understand the magnetic state of Ba4Ru3O10
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