Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 57: Correlated Magnetism – Kagome Systems
TT 57.6: Talk
Wednesday, March 11, 2026, 16:15–16:30, CHE/0091
Anisotropic Transient Reflectivity Observed in Fe-Sn Kagome Binary Compounds — •Marcos Vinicius Goncalves Faria1, 2, Alexej Pashkin1, Stephan Winnerl1, Manfred Helm1, 2, Hechang Lei3, Qi Wang3, Jure Demsar4, Chandra Kotyada4, Lilian Prodan5, István Kézsmárki5, and Ece Uykur1 — 1Helmholtz-Zentrum Dresden-Rossendorf — 2Technische Universität Dresden — 3Renmin University of China — 4Johanes Gutenberg University Mainz — 5Universität Augsburg
In this work, we investigate the interlayer coupling in Fe-Sn Kagome binaries using ultrafast transient reflectivity. Previous pump-probe studies have revealed that many Kagome metals exhibit similar relaxation features when probing the Kagome plane. However, the ultrafast response changes significantly by moving the probe direction from in-plane to out-of-plane, which we ascribe to the confinement of localized carriers in the Kagome layers. Such anisotropic behavior is consistent with what has also been observed with resistivity and broadband optics. The strong coupling between the Kagome layers shows that the single-Kagome layer approximation is not sufficient to describe the physics in this material family.
Beyond electronic anisotropy, the presence of magnetism, CDW and other lattice instabilities can strongly influence the nonequilibrium response of Kagome metals. Fe3Sn and Fe3Sn2 are systems where there is an in-plane breathing mode and a coherent optical phonon can be excited. However, for FeSn, which has a pristine Kagome lattice, no coherent phonon could be observed.
Keywords: Kagome metals; Optical pump-probe; Fe-Sn binaries