Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 47: Quantum Magnets, Molecular Magnets and Skyrmions

TT 47.9: Vortrag

Mittwoch, 3. April 2019, 17:15–17:30, H23

Spiral ordering in the edge sharing chain cuprate CuSiO3 — •Dijana Milosavljevic1, Andrei Gippius2, Michael Baenitz1, Stefan-Ludwig Drechsler3, Oleg Janson3, Johannes Richter4, and Helge Rosner11MPI Chemical Physics of Solids, Dresden — 2Lomonosov Moscow State University — 3IFW Dresden — 4MPI Physics of Complex Systems, Dresden

CuSiO3 is spin-1/2 cuprate system isostructural to the famous Spin-Peierls system CuGeO3 [1]. Due to this similarity, the compound was described previously as a quasi one-dimensional J1J2 chain compound with strongly dominating J2 [2]. Experimentally, the system orders antiferromagnetically at about 8 K with a propagation vector of (1/2 0 1/8) with the structural Cu-O chains running along c [3]. This spiral ordering is inconsistent with the previous parametrisation, motivating a re-investigation of the compound. Re-determining crystal structure and sample composition by synchrotron XRD and applying density functional calculations together with high temperature series expansion, we suggest a new parameter set of exchange couplings that is consistent with all experimental findings. The new magnetic model describes the compound in terms of strongly antiferromagnetically coupled J1J2 chains with a ferromagnetic J1 of about 35 K and a frustration ratio α=|J2/J1|∼ 0.35..
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