Evidence of High Electron Mobility in Magnetic Kagome Topological Metal FeSn Thin Films

Overview

Journal Nanoscale Adv

Publisher Royal Society of Chemistry

Specialty Biotechnology

Date 2024 Nov 1

PMID 39484150

Authors

Lorenzo Mosesso

Luca Tomarchio

Niraj Bhattarai

Salvatore Macis

Paola Gori

Antonio Grilli

Mariangela Cestelli Guidi

John Philip

Olivia Pulci

Stefano Lupi

Affiliations

Soon will be listed here.

Abstract

We present a systematic study of the low-energy electrodynamics of the magnetic FeSn kagome metal, which hosts both topological (Dirac) and non-trivial states. Our results reveal that the optical conductivity of FeSn shows two Drude contributions that can be associated with the linear (Dirac) and parabolic (massive) bands, with a dominance of the former to the DC conductivity at low temperatures. The weight of the Drude response shifts toward lower frequencies upon cooling due to a rapid increase in the Dirac electron mobility, which we associate with a temperature suppression of e-ph scattering. The experimental interband dielectric function is in very good agreement with that calculated within Density Functional Theory (DFT). These results provide a full description of the charge dynamics in FeSn kagome topological metal, opening the road for its use in photonic and plasmonic applications.

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