Calder, S.Vale, J. G.Bogdanov, N.Donnerer, C.Pincini, D.Sala, M. MorettiLiu, X.Upton, M. H.Casa, D.Shi, Y. G.Tsujimoto, Y.Yamaura, K.Hill, J. P.Van Den Brink, J.Mcmorrow, D. F.Christianson, A. D.2017-05-012017-05-012017-05-01201710.1103/PhysRevB.95.020413https://infoscience.epfl.ch/handle/20.500.14299/136652WOS:000398728100004NaOsO3 hosts a rare manifestation of a metal-insulator transition driven by magnetic correlations, placing the magnetic exchange interactions in a central role. We use resonant inelastic x-ray scattering to directly probe these magnetic exchange interactions. A dispersive and strongly gapped (58 meV) excitation is observed, indicating appreciable spin-orbit coupling in this 5d(3) system. The excitation is well described within a minimal model Hamiltonian with strong anisotropy and Heisenberg exchange (J(1) = J(2) = 13.9 meV). The observed behavior places NaOsO3 on the boundary between localized and itinerant magnetism.text::journal::journal article::research article