TY  - JOUR
AU  - Klobes, Benedikt
AU  - Angst, Manuel
AU  - Fenske, Daniela
AU  - Konnur, Chinmay M.
AU  - Mahmoud, Abdelfattah
AU  - Sougrati, Moulay Tahar
TI  - Magnetism and hyperfine interactions in the hexagonal polymorph of delafossite CuFeO 2
JO  - Journal of magnetism and magnetic materials
VL  - 570
SN  - 0304-8853
CY  - Amsterdam
PB  - North-Holland Publ. Co.
M1  - FZJ-2023-02556
SP  - 170469 -
PY  - 2023
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000949764900001
DO  - DOI:10.1016/j.jmmm.2023.170469
UR  - https://juser.fz-juelich.de/record/1008962
ER  -