Electrodynamics of electron-doped iron pnictide superconductors: Normal-state properties

N. Barišić, D. Wu, M. Dressel, L. J. Li, G. H. Cao, and Z. A. Xu
Phys. Rev. B 82, 054518 – Published 20 August 2010

Abstract

The electrodynamic properties of Ba(Fe0.92Co0.08)2As2 and Ba(Fe0.95Ni0.05)2As2 single crystals have been investigated by reflectivity measurements in a wide frequency range. In the metallic state, the optical conductivity consists of a broad incoherent background and a narrow Drude-type component which determines the transport properties; only the latter contribution strongly depends on the composition and temperature. This subsystem reveals a T2 behavior in the dc resistivity and scattering rate disclosing a hidden Fermi-liquid behavior in the 122 iron pnictide family. An extended Drude analysis yields the frequency dependence of the effective mass (with m/mb5 in the static limit) and scattering rate that does not disclose a simple power law. The spectral weight shifts to lower energies upon cooling; a significant fraction is not recovered within the infrared range of frequencies.

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  • Received 9 April 2010

DOI:https://doi.org/10.1103/PhysRevB.82.054518

©2010 American Physical Society

Authors & Affiliations

N. Barišić, D. Wu, and M. Dressel

  • 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

L. J. Li, G. H. Cao, and Z. A. Xu

  • Department of Physics, Zhejiang University, Hangzhou 310027, People’s Republic of China

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Vol. 82, Iss. 5 — 1 August 2010

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