Extended Drude model and role of interband transitions in the mid-infrared spectra of pnictides

Details Extended Drude model and role of interband transitions in the mid-infrared spectra of pnictides Extended Drude model and role of interband transitions in the mid-infrared spectra of pnictides

2011-04-07

arxiv.org/abs/1104.1346v2

Phys. Rev. B 83, 224514 (2011)

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.83.224514

We analyze the outcomes of an extended-Drude-model approach to the optical spectra of pnictides, where the multiband nature of the electronic excitations requires a careful analysis of the role of interband processes in the optical conductivity.Through a direct comparison between model calculations of the intraband optical spectra and experimental data, we show that interband transitions,whose relevance is shown by first-principle calculations,give a non negligible contribution already in the infrared region. This leads to a substantial failure of the extended-Drude-model analysis on the measured optical data without subtraction of interband contributions.

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