SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.65: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Dilution of polar antiferromagnet Co₂Mo₃O₈ — •Lilian Prodan^1,2, Irina Filippova², Alexander Tsirlin³, Vladimir Tsurkan^1,2, and Istvan Kezsmarki¹ — ¹Experimental Physics V, Institute of Physics, University of Augsburg, D-86159, Augsburg, Germany — ²Institute of Applied Physics, MD 2028, Chisinau, R. Moldova — ³Felix Bloch Institute for Solid-State Physics, Leipzig University, 04103 Leipzig, Germany

Antiferromagnetic materials hold great promise for design of ultra-fast and energy-efficient spintronic devices. To this end, understanding the robustness of crystal and magnetic structures and their manipulation are of high importance. Here, we report the effects of site-selective substitution of Zn²⁺ for Co²⁺ ions on the crystal structure, magnetic and thermodynamic properties of the hexagonal polar antiferromagnet Co₂Mo₃O₈. In contrast to the transformation from the antiferromagnetic to a ferrimagnetic state in the isostructural Fe₂Mo₃O₈ upon even a small Zn-doping [1], a robust antiferromagnetic behavior is preserved in Co_2−xZn_xMo₃O₈ up to x = 0.55. We found that in the low doping regime (x < 0.2) the Zn²⁺ ions primarily occupy the octahedrally coordinated sites, although at higher doping levels they show a clear preference for occupying the tetrahedral sites [2]. Due to the multiple inter-layer exchange paths, dependent on the different coordination of the Co²⁺ ions, the site-selective substitution is reflected in the non-monotonic variation of the magnetic parameters.

[1] T. Kurumaji, et al., Phys. Rev. X 5, 031034 (2015).

[2] L. Prodan, et al., Phys. Rev. B 106, 174421 (2022).