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Topochemical nitridation of Sr2FeMoO6

Abstract

The nitridation of cation ordered, tetragonal Sr2FeMoO6 in NH3 at moderate temperatures leads to the cubic, Fm-3m double perovskite oxynitride Sr2FeMoO4.9N1.1 where double-exchange interactions determine ferromagnetic order with Tc ≈ 100 K. Substitution of oxide by nitride induces bond asymmetries and local electronically-driven structural distortions, which combined with Fermi level lowering restrict charge itineracy to confined regions and preclude spontaneous long-range magnetic order. Under a magnetic field, ferromagnetic correlations expand, favoring charge delocalization and a negative magnetoresistance is observed.

  • This article is part of the themed collection: Perovskites
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Publication details

The article was received on 12 Dec 2018, accepted on 13 Feb 2019 and first published on 13 Feb 2019


Article type: Communication
DOI: 10.1039/C8CC09845J
Citation: Chem. Commun., 2019, Accepted Manuscript

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    Topochemical nitridation of Sr2FeMoO6

    R. Ceravola, C. Frontera, J. Oró-Solé, A. P. Black, C. Ritter, I. Mata, E. Molins, J. Fontcuberta and A. Fuertes, Chem. Commun., 2019, Accepted Manuscript , DOI: 10.1039/C8CC09845J

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