Canted antiferromagnetism in high purity $\mathrm{NaFeF_3}$ prepared by a novel wet-chemical synthesis method
| Autor: | David S. Wragg, Wojciech A. Sławiński, Bruno Gonano, Fredrik Lundvall, Fabian L. M. Bernal, Øystein Fjellvåg, Helmer Fjellvåg, Fabien Veillon |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Physics and Astronomy (miscellaneous) Magnetic structure Neutron diffraction Zero (complex analysis) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Crystallography Condensed Matter::Materials Science Ferromagnetism Impurity 0103 physical sciences Antiferromagnetism General Materials Science Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Spin canting |
| Zdroj: | PHYSICAL REVIEW MATERIALS |
| ISSN: | 2475-9953 |
| Popis: | We report a novel synthesis method for, and structural and magnetic characterization of the fluoroperovskite $\mathrm{NaFeF_3}$. We have developed a wet-chemical method that allows preparation of large volumes of air-sensitive fluoroperovskites with high purity. $\mathrm{NaFeF_3}$ has a N\'eel temperature ($T_N$) of 90 K and a Weiss constant ($\theta$) of -124 K, corresponding to dominant antiferromagnetic interactions. Below $T_N$, a slight difference is observed between zero-field and field cooled samples, indicating spin-canting and weak ferromagnetism. AC magnetometry confirms that weak ferromagnetism is inherent to $\mathrm{NaFeF_3}$ and not due to impurities. From powder neutron diffraction data, we describe the magnetic structure precisely as a weakly canted G-type (magnetic space group $Pn'ma'$). A ferromagnetic component is allowed in $Pn'ma'$, however, this component may be absent in zero magnetic fields and is too small to be confirmed on the basis of powder neutron diffraction data. Comment: 9 pages, 10 figures |
| Databáze: | OpenAIRE |
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