Magnetically driven metal-insulator transition in NaOsO3

Abstract

The metal-insulator transition (MIT) is one of the most dramatic manifestations of electron correlations in materials. Various mechanisms producing MITs have been extensively considered, including the Mott (electron localization via Coulomb repulsion), Anderson (localization via disorder) and Peierls (localization via distortion of a periodic 1D lattice). One additional route to a MIT proposed by Slater, in which long-range magnetic order in a three dimensional system drives the MIT, has received relatively little attention. Using neutron and X-ray scattering we show that the MIT in NaOsO3 is coincident with the onset of long-range commensurate three dimensional magnetic order. Whilst candidate materials have been suggested, our experimental methodology allows the first definitive demonstration of the long predicted Slater MIT. We discuss our results in the light of recent reports of a Mott spin-orbit insulating state in other 5d oxides.

References in corpus (6)

• Mott physics and band topology in materials with strong spin-orbit interaction
• Reduced effective spin-orbital degeneracy and spin-orbital ordering in paramagnetic transition metal oxides: Sr2IrO4 vs. Sr2RhO4
• Spin-orbit coupling in $d^2$ ordered double perovskites
• Continuous metal-insulator transition of the antiferromagnetic perovskite NaOsO3
• Searching for the Slater Transition in the Pyrochlore Cd${}_2$Os${}_2$O${}_7$ with Infrared Spectroscopy
• Electronic structure and magnetic properties of NaOsO${}_3$

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