High-pressure polymorph ofLuFe2O4with room-temperature antiferromagnetic order
| Autor: | Thomas Hansen, Maryvonne Hervieu, C. Martin, J. Bourgeois, Leszek Konczewicz, Anne Guesdon, Erik Elkaim, Tahar Hammouda, Jérôme Rouquette, Patrick Hermet, Françoise Damay, Maria Poienar, Julien Haines |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Physical Review B. 91 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.91.214111 |
| Popis: | Branded for its potential electronic ferroelectricity, charge-ordered $\mathrm{LuF}{\mathrm{e}}_{2}{\mathrm{O}}_{4}$ has a layered Fe triangular framework, whose topology is a source of degeneracy, both at the charge and spin levels. Here we present an in-depth characterization of $\mathrm{LuF}{\mathrm{e}}_{2}{\mathrm{O}}_{4}\text{\ensuremath{-}}hp$, the high-pressure $(hp)$ polymorph of $\mathrm{LuF}{\mathrm{e}}_{2}{\mathrm{O}}_{4}$, using electron, x-ray, and neutron diffraction, combined with transport and magnetization measurements. We show that $\mathrm{LuF}{\mathrm{e}}_{2}{\mathrm{O}}_{4}\text{\ensuremath{-}}hp$ is characterized by a misfit-related monoclinic structure, accommodating a buckled triangular ${[\mathrm{Lu}]}_{\ensuremath{\infty}}$ layer and two shifted adjacent rectangular ${[\mathrm{Fe}]}_{\ensuremath{\infty}}$ planes belonging to a distorted rock salt--type layer. The release of the geometric frustration of the Fe magnetic lattice in the $hp$ form leads to collinear antiferromagnetic ordering at ${T}_{N}=380\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Possible coexistence of charge and magnetic orders in this material opens research pathways for the design of tunable multifunctional devices using high-pressure techniques. |
| Databáze: | OpenAIRE |
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