Coherent phonon and unconventional carriers in the magnetic kagome metal Fe<subscript>3</subscript>Sn<subscript>2</subscript>.
In: NPJ Quantum Materials, Jg. 9 (2024-03-21), Heft 1, S. 1-6
Online
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Zugriff:
Temperature- and fluence-dependent carrier dynamics of the magnetic kagome metal Fe 3 Sn 2 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 A 1g 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 Fe 3 Sn 2 . Our results suggest an unexpected connection between Fe 3 Sn 2 and kagome metals with CDW instabilities and a strong interplay between phonon and electron dynamics in this compound. [ABSTRACT FROM AUTHOR]
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Titel: |
Coherent phonon and unconventional carriers in the magnetic kagome metal Fe<subscript>3</subscript>Sn<subscript>2</subscript>.
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Autor/in / Beteiligte Person: | Gonçalves-Faria, Marcos V. ; Pashkin, Alexej ; Wang, Qi ; Lei, Hechang C. ; Winnerl, Stephan ; Tsirlin, Alexander A. ; Helm, Manfred ; Uykur, Ece |
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Zeitschrift: | NPJ Quantum Materials, Jg. 9 (2024-03-21), Heft 1, S. 1-6 |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 2397-4648 (print) |
DOI: | 10.1038/s41535-024-00642-6 |
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