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O: Fachverband Oberflächenphysik
O 29: 2D Materials: Electronic Structure and Exitations I (joint session O/HL/TT)
O 29.7: Vortrag
Dienstag, 18. März 2025, 12:00–12:15, H8
Unraveling magnetic ordering in a van der Waals correlated material — Tommaso Pincelli1,2, •Tania Mukherjee1,2, Lawson Lloyd2, Shuo Dong2,3, Yoav William Windsor1,2, Martin Wolf2, Laurenz Rettig2, and Ralph Ernstorfer1,2 — 1Technische Universität Berlin, 10623 Berlin, Germany — 2Fritz-Haber-Institute of the Max Planck Society, 14195 Berlin, Germany — 3Beijing National Laboratory for Condensed Matter Physics, China
Layered van der Waals (vdW) materials offer a compelling platform to investigate various emergent quantum properties in low dimensions. Fe3GeTe2 (FGT), a vdW ferromagnetic metal, is well-known for exhibiting exotic phenomena, ranging from skyrmion formation to heavy fermion behavior. However, an understanding of the magnetic ordering, a key feature for spintronic applications, still remains elusive in this material. In particular, the interplay of both local magnetic moments and an itinerant mechanism in the formation of ferromagnetic ordering in FGT, a non-f-electron correlated system, remains to be clarified. Using time- and angle-resolved photoemission spectroscopy (trARPES) and first-principles calculations, we provide evidence for an ordering mechanism in FGT by observing a pronounced reduction in the Stoner exchange gap. This stands in contrast to earlier temperature-dependent ARPES studies of the electronic structure of FGT, which favored a localized excitation model over the weak-coupling itinerant picture. We also observe the impact of phononic excitations which further confirm our findings.
Keywords: 2D materials; Magnetic excitations; Stoner Demagnetization; trARPES; First Principles Calculations