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MA: Fachverband Magnetismus

MA 59: Posters Magnetism III

MA 59.35: Poster

Freitag, 20. März 2020, 09:00–12:00, P2/EG

Lattice instability of the novel multiferroic Cu₉O₂(SeO₃)₄Cl₆ — •Ksenia Denisova^1,2, Dirk Wulferding¹, Dirk Menzel¹, Olga Maximova², Helmuth Berger³, Jiunn-Yuan Lin⁴, Alexander Vasiliev², and Peter Lemmens¹ — ¹IPKM, TU-BS, Braunschweig, Germany — ²Faculty of Physics, MSU, Moscow, Russia — ³EPFL, Lausanne, Switzerland — ⁴NCTU, Hsinchu, Taiwan

Due to the combination of lone-pair ferroelectricity and d-electron magnetism high T_c multiferroicity is observed in many transition metal oxohalides [1,2]. The new type-I multiferroic Cu₉O₂(SeO₃)₄Cl₆ exhibits long range magnetic ordering at T_N = 37 K and a polar ordering at T_E = 270 K [3]. Our Raman study reveals signs of both magnetic and electric phase transitions: spin-phonon coupling below T_N, appearance of new lines of magnetic origin for T<T^* = 16 K, and a symmetry lowering for T<T_E. Evidence for an additional lattice instability at 100 K is reported. Work supported by NUST "MISiS" Grant No. K2-2017-084. [1] L. Zhao, et al., Sci. Adv. 2, e1600353 (2016). [2] H. C. Wu, et al., PRB 95 125121 (2017). [3] H. C. Wu, et al., PRB in print (2019).