Electronic Structure and Charge Dynamics of Huesler Alloy Fe2TiSn Probed by Infrared and Optical Spectroscopy

Abstract

We report on the electrodynamics of a Heusler alloy Fe2TiSn probed over four decades in energy: from the far infrared to the ultraviolet. Our results do not support the suggestion of Kondo-lattice behavior inferred from specific heat measurements. Instead, we find a conventional Drude-like response of free carriers, with two additional absorption bands centered at around 0.1 and 0.87 eV. The latter feature can be interpreted as excitations across a pseudogap, in accord with band structure calculations.

3 pages, 4 figures

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• Origin of efficient thermoelectric performance in half-Heusler FeNb${}_{0.8}$Ti${}_{0.2}$Sb
• Roles of Defects and Sb-doping in the Thermoelectric Properties of Full-Heusler Fe2TiSn
• Observation of Griffiths-like phase in the quaternary Heusler compound NiFeTiSn