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• W1987665045 abstract "We present a comprehensive optical study of the narrow gap FeSb2 semiconductor. From the optical reflectivity, measured from the far infrared up to the ultraviolet spectral range, we extract the complete absorption spectrum, represented by the real part σ1(ω) of the complex optical conductivity. With decreasing temperature below 80 K, we find a progressive depletion of σ1(ω) below Eg∼300 cm-1, the semiconducting optical gap. The suppressed (Drude) spectral weight within the gap is transferred at energies ω>Eg and also partially piles up over a continuum of excitations extending in the spectral range between zero and Eg. Moreover, the interaction of one phonon mode with this continuum leads to an asymmetric phonon shape. Even though several analogies between FeSb2 and FeSi were claimed and a Kondo-insulator scenario was also invoked for both systems, our data on FeSb2 differ in several aspects from those of FeSi. The relevance of our findings with respect to the Kondo insulator description will be addressed." @default.
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• W1987665045 date "2006-11-01" @default.
• W1987665045 modified "2023-09-27" @default.
• W1987665045 title "Optical investigation of the metal-insulator transition in FeSb2" @default.
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• W1987665045 doi "https://doi.org/10.1140/epjb/e2006-00433-1" @default.
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