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- Title
Coherent phonon and unconventional carriers in the magnetic kagome metal Fe<sub>3</sub>Sn<sub>2</sub>.
- Authors
Gonçalves-Faria, Marcos V.; Pashkin, Alexej; Wang, Qi; Lei, Hechang C.; Winnerl, Stephan; Tsirlin, Alexander A.; Helm, Manfred; Uykur, Ece
- Abstract
Temperature- and fluence-dependent carrier dynamics of the magnetic kagome metal Fe3Sn2 were studied using the ultrafast optical pump-probe technique. Two carrier relaxation processes and a laser-induced coherent optical phonon were observed. We ascribe the shorter relaxation (~1 ps) to hot electrons transferring their energy to the crystal lattice via electron–phonon scattering. The second relaxation (~30 ps), on the other hand, cannot be explained as a conventional process, and we attributed it to the unconventional (localized) carriers in the material. The observed coherent oscillation is assigned to be a totally symmetric A1g optical phonon dominated by Sn displacements out of the kagome planes and possesses a prominently large amplitude, on the order of 10−3, comparable to the maximum of the reflectivity change (ΔR/R). This amplitude is similar to what has been observed for coherent phonons in charge-density-wave (CDW) systems, although no signs of such instability were hitherto reported in Fe3Sn2. Our results suggest an unexpected connection between Fe3Sn2 and kagome metals with CDW instabilities and a strong interplay between phonon and electron dynamics in this compound.
- Subjects
PHONONS; CRYSTAL lattices; PUMP probe spectroscopy; HOT carriers; ELECTRON scattering; CHARGE exchange; METALS
- Publication
NPJ Quantum Materials, 2024, Vol 9, Issue 1, p1
- ISSN
2397-4648
- Publication type
Article
- DOI
10.1038/s41535-024-00642-6