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TT: Fachverband Tiefe Temperaturen

TT 64: Frustrated Magnets - α-RuCl₃ and Cu-based Materials

TT 64.7: Vortrag

Mittwoch, 14. März 2018, 16:45–17:00, HFT-FT 101

Magnetic excitations and lattice dynamics in the s=1/2 pseudo-kagome system Cu₃Bi(SeO₃)₂O₂(Br,Cl) — Vladimir Gnezdilov¹, Dirk Wulferding^2,3, •Peter Lemmens^2,3, Vladimir Kurnosov¹, Yurii Pashkevich⁴, Peter Berdonosov⁵, and Alexander Vasiliev⁵ — ¹ILTPE, NASU, Kharkov, Ukraine — ²IPKM, TU-BS, Braunschweig, Germany — ³LENA, TU-BS, Braunschweig, Germany — ⁴DonFTI, NASU, Donetsk, Ukraine — ⁵MSU, Moscow, Russia

The francisites Cu₃Bi(SeO₃)₂O₂Br and Cu₃Bi(SeO₃)₂O₂Cl form layered pseudo-kagome structures, resulting in a highly spin frustrated state [1]. Our temperature- and field-dependent study uncovers strong lattice dynamics in Cu₃Bi(SeO₃)₂O₂Cl, that are absent in the -Br system. The origin of a low-energy excitation emerging in the magnetically ordered phase is discussed with respect to its magnetic field response and selection rule.

Work supported by DFG Project LE967/16-1.
Gnezdilov, et al., PRB 96, 115144 (2017).