Regensburg 2019 – wissenschaftliches Programm
MA 7.10: Vortrag
Montag, 1. April 2019, 17:45–18:00, H37
Multi-k spin textures in the complex magnetic phase diagram of rare-earth copper compounds — •Wolfgang Simeth1, Marein Rahn2, Andreas Bauer1, Robert Georgii3, Matthias Gutmann7, Vladimir Hutanu3, Pascal Manuel7, Martin Meven3, Sebastian Mühlbauer3, Kirill Nemkovski4, Bachir Ouladdiaf6, Karel Prokes5, Tobias Schrader3,4, and Christian Pfleiderer1 — 1Technische Universität München — 2Los Alamos National Laboratory — 3Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II) — 4Forschungszentrum Jülich — 5Helmholtz-Zentrum Berlin — 6Institut Laue-Langevin — 7ISIS neutron and muon source
The rare-earth intermetallics RCu (R = Ho, Tm, Er) condense in the centrosymmetric CsCl-structure. As a consequence of several competing interactions (itinerant, indirect exchange, quadrupolar interactions as well as crystal electric fields), a rich magnetic phase diagram with a multitude of phase pockets unfolds. In these phases, the localized 4f magnetic moments exhibit complex arrangements as magnetic ground states. For a proper determination of these structures, several neutron techniques were combined. Both as a function of temperature and field the compounds undergo phase transitions between several antiferromagnetic multi-k states. The textures we identified are highly non-collinear and exhibit modulations with a large wavelength in the range of nanometres.