Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Skyrmions I
MA 16.1: Vortrag
Dienstag, 10. März 2026, 09:30–09:45, HSZ/0004
Charge Order, Spin textures, and Electronic Structure of Eu(Ga,Al)4 — Steven Gebel1, Aleksandr Sukhanov2, Artem Korshunov3, Jaime Moya4, Kevin Allen5, Emilia Morosan5, and •Marein Rahn2 — 1TU Dresden, Germany — 2Universität Augsburg, Germany — 3ESRF, Grenoble, France — 4Princeton University, USA — 5Rice University, USA
The tetragonal intermetallic series Eu(Ga,Al)4, is known for a range of interesting phenomena, ranging from the nodal line semimetal EuGa4 to centrosymmetric skyrmion phases in EuAl4. It would be of great interest to design the band topology of these materials and, in particular, to understand how it may couple to electronic correlations. To this end, one must clarify by what mechanisms the multifaceted spin- and charge-ordering instabilities of this series arise from the underlying electronic band structure. For instance, structural modifications and charge density waves exist throughout the series, but show a variable response to hydrostatic pressure – hinting at competing mechanisms. We provide an overview of the ordered phases in Eu(Ga,Al)4 and then show how X-ray crystallography using diamond anvil pressure cells draws a clear line between different structural instabilities. Complementary measurements using inelastic X-ray scattering also provide evidence on the underlying electron-phonon coupling mechanisms. Our results provide a tentative x-P-T phase diagram of Eu(Ga1−xAlx)4 and highlight interesting questions, e.g. regarding the origin of anomalous Hall effects in EuGa4 and the nature of a new pressure-induced structural phase of EuAl4.
Keywords: Skyrmions; Weyl semimetals; charge density waves; high pressure (diamond anvil cells); phonon softening