Berlin 2015 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 70: Correlated Electrons: Spin Systems and Itinerant Magnets – Chiral Magnets (jointly with MA)

TT 70.5: Talk

Wednesday, March 18, 2015, 19:00–19:15, H 3005

BaMn₉[VO₄]₆(OH)₂, a novel candidate for the observation of a Skyrmion lattice — •Angela Möller¹, Kewen Sun¹, Vladimir Gnezdilov^2,3, and Peter Lemmens³ — ¹Department of Chemistry and TcSUH, University of Houston, United States — ²ILTPE NAS, Kharkov, Ukraine — ³IPKM, TU-BS, Braunschweig, Germany

The search for topologically stable vortex-like objects (Skyrmions) in insulating chiral magnets lead to their discovery in Cu₂OSeO₃ [1]. We will show that the combination of certain structural features, such as chirality and frustration might expedite the finding of new candidates of this rare class. A chiral paddle-wheel type of structure featuring geometric frustration has been reported for the metrically cubic title compound with ferrimagnetic, Tc=18 K, and dielectric anomalies [2]. Interestingly, Raman scattering shows magnetoelastic coupling of several phonons but no spontaneous symmetry reduction. This is considered a prerequisite for the existence of a Skyrmion lattice.

This work was supported by the NSF (DMR-1149899) and RTG-DFG 1953/1.

[1] Seki et al., Science 336, 198 (2012);

T. Adams et al., PRL 108, 237204 (2012).

[2] K. Sun et al., Inorg. Chem. dx.doi.org/10.1021/ic502266k.