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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 Milosavljevic1,2, Andrei Gippius3, Oleg Janson4, Michael Baenitz1, Yurii Prots1, Johannes Richter5, and Helge Rosner11MPI 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)

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