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| Hauptseite > Publikationsdatenbank > Magnetism and hyperfine interactions in the hexagonal polymorph of delafossite CuFeO 2 |
| Hauptseite > Publikationsdatenbank > Magnetism and hyperfine interactions in the hexagonal polymorph of delafossite CuFeO 2 |
| Journal Article | FZJ-2023-02556 |
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2023
North-Holland Publ. Co.
Amsterdam
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Please use a persistent id in citations: doi:10.1016/j.jmmm.2023.170469 doi:10.34734/FZJ-2023-02556
Abstract: The magnetic susceptibility of and hyperfine interactions in the hexagonal 2H polymorph of delafossite CuFeO were investigated by SQUID magnetometry and Mössbauer spectroscopy, respectively, at low temperatures. The hydrothermally synthesized 2H-CuFeO sample contained a 10 vol-% -FeO impurity detected by X-ray diffraction, whose contribution to the susceptibility and hyperfine interactions were easily distinguishable from the major 2H-CuFeO 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-CuFeO 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.
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