Canted antiferromagnetism in high-purity NaFeF3 prepared by a novel wet-chemical synthesis method

Fabian L. M. Bernal, Bruno Gonano, Fredrik Lundvall, David S. Wragg, Helmer Fjellvåg, Fabien Veillon, Wojciech A. Sławiński, and Øystein S. Fjellvåg
Phys. Rev. Materials 4, 114412 – Published 17 November 2020
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Abstract

We report a synthesis method, and structural and magnetic characterization, for the fluoroperovskite NaFeF3. We have developed a wet-chemical method that allows preparation of large volumes of air-sensitive fluoroperovskites with high purity. NaFeF3 has a Néel temperature (TN) of 90 K and a Weiss constant (θ) of −124 K, corresponding to dominant antiferromagnetic interactions. Below TN, a slight difference is observed between zero-field and field-cooled samples, indicating spin canting and weak ferromagnetism. AC magnetometry supports that weak ferromagnetism is inherent to NaFeF3 and not due to an impurity. From powder neutron diffraction data, we describe the magnetic structure precisely as a weakly canted G-type (magnetic space group Pnma). A ferromagnetic component is allowed in Pnma, however, this component is too small to be confirmed on the basis of powder neutron diffraction data and may be absent in zero magnetic fields.

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  • Received 21 July 2020
  • Revised 14 October 2020
  • Accepted 29 October 2020

DOI:https://doi.org/10.1103/PhysRevMaterials.4.114412

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Fabian L. M. Bernal, Bruno Gonano2, Fredrik Lundvall2, David S. Wragg2, and Helmer Fjellvåg2,*

  • Chemistry Department and Center for Material Science and Nanotechnology, University of Oslo, NO-0315 Oslo, Norway

Fabien Veillon

  • Laboratory Crismat, UMR6508 CNRS, Normandie University, ENSICAEN, UNICAEN, 6 bd Maréchal Juin, 1450 Caen cedex 4, France

Wojciech A. Sławiński

  • Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland and ISIS Facility, Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxfordshire OX11 0QX, United Kingdom

Øystein S. Fjellvåg

  • Department for Neutron Materials Characterization, Institute for Energy Technology, PO Box 40, NO-2027 Kjeller, Norway

  • *helmer.fjellvag@kjemi.uio.no

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Issue

Vol. 4, Iss. 11 — November 2020

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