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Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Magnetic textures II

MA 51.6: Vortrag

Donnerstag, 15. März 2018, 16:30–16:45, EB 407

Multi-axial spin textures in HoCuWolfgang Simeth1, •Marein Rahn2, Andreas Bauer1, Robert Georgii3, Martin Meven3, Kirill Nemkovski4, Sebastian Mühlbauer3, Tobias Schrader3, Anatoliy Senyshyn3, Bachir Ouladdiaf5, and Christian Pfleiderer11Technische Universität München — 2Los Alamos National Laboratory — 3Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II) — 4Forschungszentrum Jülich — 5Institut Laue-Langevin

The rare-earth intermetallic compound HoCu condenses in the centrosymmetric CsCl-structure (space group Pm3m). As a consequence of several competing interactions (itinerant, indirect, and quadrupolar exchange 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 of the rare earth atoms order in complex arrangements [1]. For a proper magnetic structure determination, several neutron techniques were used. Data for Rietveld refinement (using Jana2006 [2]) were collected at a four-circle diffractometer. Combined with a XYZ polarization analysis the possible solutions were narrowed down. Ambiguities due to multi-domain effects were suppressed by applying symmetry-breaking magnetic fields. We find that the compound orders in multi-axial AFM structures as well as large-unit-cell modulated AFM structures (∼ 15 nm) akin to the helifan-texture in elemental Ho. [1] P. Morin and D. Schmitt, J. Magn. Magn. Mater. 21, 243 (1980). [2] V. Petricek, M. Dusek and L. Palatinus, Z. Kristallogr. 229(5), 345 (2014).

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