Topochemical nitridation of Sr2FeMoO6
| Autor: | Ignasi Mata, Judith Oró-Solé, Roberta Ceravola, Carlos Frontera, Amparo Fuertes, Elies Molins, Josep Fontcuberta, Ashley P. Black, Clemens Ritter |
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| Přispěvatelé: | Ministerio de Ciencia, Innovación y Universidades (España), Generalitat de Catalunya, Consejo Superior de Investigaciones Científicas (España), Ministerio de Economía y Competitividad (España), Institut Laue-Langevin, ALBA Synchrotron, Ceravola, Roberta, Oró, Judith, Black, Ashley P., Mata, Ignasi, Molins, Elies, Fontcuberta, Josep, Fuertes, Amparo, Ceravola, Roberta [0000-0002-3785-3854], Oró, Judith [0000-0002-3755-4950], Black, Ashley P. [0000-0001-7929-5144], Mata, Ignasi [0000-0002-4835-9659], Molins, Elies [0000-0003-1012-0551], Fontcuberta, Josep [0000-0002-7955-2320], Fuertes, Amparo [0000-0001-5338-9724] |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Magnetoresistance Oxide Nitride 010402 general chemistry 01 natural sciences Catalysis Condensed Matter::Materials Science symbols.namesake Tetragonal crystal system chemistry.chemical_compound Delocalized electron Materials Chemistry Condensed matter physics 010405 organic chemistry Fermi level Metals and Alloys General Chemistry 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Magnetic field chemistry Ferromagnetism Ceramics and Composites symbols Condensed Matter::Strongly Correlated Electrons |
| Zdroj: | Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | The topotactic nitridation of cation ordered, tetragonal Sr2FeMoO6 in NH3 at moderate temperatures leads to cubic, Fm[3 with combining macron]m 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 restricts charge itinerancy 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 work was supported by the Spanish Ministerio de Ciencia, Universidades e Investigación, Spain (Projects MAT2017-86616-R, MAT2017-85232-R, MAT2015-71664-R, MAT2015-67593-P and ENE2015-63969) and by Generalitat de Catalunya (2017SGR1377, 2017SGR581). ICMAB acknowledges financial support from MINECO through the Severo Ochoa Program (SEV-2015-0496). We thank the Institut Laue Langevin (ILL) and Alba synchrotron for the provision of beam time. We acknowledge support of the publication fee by the CSIC Open Access Support Initiative through its Unit of Information Resources for Research (URICI) |
| Databáze: | OpenAIRE |
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