Extended Drude model and role of interband transitions in the midinfrared spectra of pnictides

L. Benfatto, E. Cappelluti, L. Ortenzi, and L. Boeri
Phys. Rev. B 83, 224514 – Published 27 June 2011

Abstract

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, experimental data, and first-principles calculations we show that interband transitions 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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  • Received 26 April 2011

DOI:https://doi.org/10.1103/PhysRevB.83.224514

©2011 American Physical Society

Authors & Affiliations

L. Benfatto1, E. Cappelluti2,1, L. Ortenzi3, and L. Boeri3

  • 1Institute for Complex Systems (ISC), CNR, U.O.S. Sapienza, and Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, I-00185 Rome, Italy
  • 2Instituto de Ciencia de Materiales de Madrid, ICMM-CSIC, Cantoblanco, E-28049 Madrid, Spain
  • 3Max-Planck-Institut für Festkörperforschung, Heisenbergstraβe 1, D-70569 Stuttgart, Germany

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Issue

Vol. 83, Iss. 22 — 1 June 2011

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