SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Skyrmions I

MA 2.7: Vortrag

Montag, 27. März 2023, 11:30–11:45, HSZ 02

Relationship of charge and spin density waves in the skyrmion compound EuGa₂Al₂ — •Steven Gebel¹, Jaime Moya², Jochen Geck¹, and Marein Rahn¹ — ¹Institute for Solid State and Materials Physics, Technical University of Dresden, 01062 Dresden, Germany — ²Department of Physics and Astronomy, Rice University, Houston, TX, 77005, USA

The interplay of spin and charge density waves (SDW/CDW) in rare earth intermetallics is a matter of great interest, since it may reveal a recipe of how to taylor an antiferromagnet to yield certain topological properties. The centrosymmetric skyrmion host series Eu(Ga,Al)₄ provides an ideal setting to explore this scenario: The electronic structure can be tuned by chemical and hydrostatic pressure, which induces CDWs, which, in turn, determine a landscape of frustrated itinerant electronic correlations. To clarify the origin and character of such nesting instabilities, we studied subtle structural variations with temperature and pressure, and related them to density functional structure calculations. As magnetic structure determinations of more members of the series become available, this may explain exactly which factors toggle the magnetism’s topological character.