Article (Scientific journals)
Magnetism and hyperfine interactions in the hexagonal polymorph of delafossite CuFeO2
Klobes, Benedikt; Angst, Manuel; Fenske, Daniela et al.
2023In Journal of Magnetism and Magnetic Materials, 570, p. 170469
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Keywords :
CuFeO2; Delafossite; Magnetic susceptibility; Mössbauer spectroscopy
Abstract :
[en] The magnetic susceptibility of and hyperfine interactions in the hexagonal 2H polymorph of delafossite CuFeO2 were investigated by SQUID magnetometry and Mössbauer spectroscopy, respectively, at low temperatures. The hydrothermally synthesized 2H-CuFeO2 sample contained a 10 vol-% α-Fe2O3 impurity detected by X-ray diffraction, whose contribution to the susceptibility and hyperfine interactions were easily distinguishable from the major 2H-CuFeO2 one. Morphology and indirect optical band gap investigated by scanning electron microscopy and diffuse reflectance measurements showed well expected results for a hydrothermally synthesized delafossite sample. The magnetic susceptibility of 2H-CuFeO2 revealed a first antiferromagnetic like transitions at 16 K and a second transition at 13.5 K or 10 K depending on measurement protocol, which points towards modified exchange interactions as compared to the 3R polymorph. Complementary Mössbauer measurements revealed complicated spectral shapes at low temperatures indicating rather complex magnetic structures and magnetic relaxations above 20 K.
Disciplines :
Physics
Author, co-author :
Klobes, Benedikt ;  Bremerhaven Institute of Nanotechnology, University of Applied Sciences Bremerhaven, Bremerhaven, Germany
Angst, Manuel ;  Jülich Centre for Neutron Science JCNS and Peter Grünberg Institute PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, Germany
Fenske, Daniela;  Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Bremen, Germany
Konnur, Chinmay M. ;  Bremerhaven Institute of Nanotechnology, University of Applied Sciences Bremerhaven, Bremerhaven, Germany
Mahmoud, Abdelfattah  ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale et Chimie des matériaux inorganiques (LCIS-GreenMAT)
Sougrati, Moulay Tahar ;  Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM-ENSCM, Montpellier, France
Language :
English
Title :
Magnetism and hyperfine interactions in the hexagonal polymorph of delafossite CuFeO2
Publication date :
15 March 2023
Journal title :
Journal of Magnetism and Magnetic Materials
ISSN :
0304-8853
eISSN :
1873-4766
Publisher :
Elsevier B.V.
Volume :
570
Pages :
170469
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
We thank Dr. Raphael Hermann, Oak Ridge National Laboratory, USA, for provision of the Mössbauer analysis program.
Available on ORBi :
since 14 February 2023

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