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Article overview
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Electrodynamics of electron doped iron-pnictide superconductors: Normal state properties | | N. Barivsić
; D. Wu
; M. Dressel
; L. J. Li
; G. H. Cao
; Z. A. Xu
; | | Date: |
9 Apr 2010 | | Abstract: | The electrodynamic properties of Ba(Fe$_{0.92}$Co$_{0.08})_2$As$_{2}$ and
Ba(Fe$_{0.95}$Ni$_{0.05})_As$_{2}$ 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-like component which determines the transport properties; only the latter
contribution strongly depends on the composition and temperature. This
subsystem reveals a $T^2$ 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 $m^*/m_bapprox 5$ 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. | | Source: | arXiv, 1004.1658 | | Services: | Forum | Review | PDF | Favorites | |
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