SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Complex Oxides

TT 30.13: Vortrag

Mittwoch, 29. März 2023, 12:45–13:00, HSZ 204

A consistent microscopic magnetic model of the edge-sharing chain cuprate CuSiO₃ — •Dijana Milosavljevic^1,2, Andrei Gippius³, Oleg Janson⁴, Michael Baenitz¹, Yurii Prots¹, Johannes Richter⁵, and Helge Rosner¹ — ¹MPI for Chemical Physics of Solids, Dresden — ²MPI of Microstructure Physics, Halle — ³Moskow, Russia — ⁴IFW, Dresden — ⁵MPI Physics of Complex Systems, Dresden

A unique place in the family of low-dimensional magnets occupies the Cu²⁺ compounds featuring a series of square-planar CuO₄ plaquettes connected via their edges, forming in this way a chain. The edge-shared plaquettes in Li₂CuO₂ show ferromagnetic ordering [1], whereas similar chains with increased Cu-O-Cu bond angle bridging neighboring Cu atoms in CuGeO₃, undergo a spin-Peierls transition [2]. A compound with a Cu-O-Cu angle essentially identical to the one in Li₂CuO₂ and isostructural to the famous Spin-Peierls system CuGeO₃ is spin-1/2 cuprate CuSiO₃ [3]. In a combined experimental-theoretical approach, we derive a new magnetic model of CuSiO₃, consistent with all reported experimental results.

[1] E.L.M Chung et al., Phys. Rev. B 68, 144410 (2003)

[2] M. Hase et al., Phys. Rev. Lett. 70, 3651 (1993)

[3] H. H. Otto et al., Z. Kristallogr. 214, 558 (1999)