Berlin 2015 – wissenschaftliches Programm
TT 70.5: Vortrag
Mittwoch, 18. März 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 Gnezdilov2,3, 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 . 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 . 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.
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