Long-Range Antiferromagnetic Order in a Rocksalt High Entropy Oxide
| Autor: | Hong Zheng, Yang Ren, Katharine Page, Qiang Zheng, Michael A. McGuire, Junjie Zhang, Douglas L. Abernathy, Stuart Calder, John D. Budai, Raphaël P. Hermann, Jiaqiang Yan, John W. Freeland, Saul H. Lapidus |
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| Rok vydání: | 2019 |
| Předmět: |
Neutron powder diffraction
Condensed Matter - Materials Science Range (particle radiation) Materials science Magnetic structure Condensed matter physics General Chemical Engineering Oxide Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Order (ring theory) 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Condensed Matter::Materials Science chemistry.chemical_compound chemistry Materials Chemistry Antiferromagnetism 0210 nano-technology |
| Zdroj: | Chemistry of Materials. 31:3705-3711 |
| ISSN: | 1520-5002 0897-4756 |
| Popis: | We report for the first time the magnetic structure of the high entropy oxide $(Mg_{0.2}Co_{0.2}Ni_{0.2}Cu_{0.2}Zn_{0.2})O$ using neutron powder diffraction. This material exhibits a sluggish magnetic transition but possesses a long-range ordered antiferromagnetic ground state, as revealed by DC and AC magnetic susceptibility, elastic and inelastic neutron scattering measurements. The magnetic propagation wavevector is k=(1/2, 1/2, 1/2) based on the cubic structure Fm-3m, and the magnetic structure consists of ferromagnetic sheets in the (111) planes with spins antiparallel between two neighboring planes. Inelastic neutron scattering reveals strong magnetic excitations at 100 K that survive up to room temperature. This work demonstrates that entropy-stabilized oxides represent a unique platform to study long range magnetic order with extreme chemical disorder. Comment: 13 pages, 4 figures, supplemental material is upon request |
| Databáze: | OpenAIRE |
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