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Electronic structure and charge dynamics of the Heusler alloy Fe 2 TiSn probed by infrared and optical spectroscopy

2002; American Physical Society; Volume: 66; Issue: 7 Linguagem: Inglês

10.1103/physrevb.66.075122

1095-3795

S. V. Dordevic, D. N. Basov, A. Ślebarski, M. B. Maple, L. Degiorgi,

Intermetallics and Advanced Alloy Properties

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.