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

Autori
Barišić, Neven ; Wu, D. ; Dressel, M. ; Li, L.J. ; Cao, G.H. ; Xu, Z.A.

Izvornik
Physical Review B - Condensed Matter and Materials Physics (1098-0121) 82 (2010), 5; 054518-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Ba(Fe(0.92)Co(0.08))(2)As(2) and Ba(Fe(0.95)Ni(0.05))(2)As(2)

Sažetak
The electrodynamic properties of Ba(Fe(0.92)Co(0.08))(2)As(2) and Ba(Fe(0.95)Ni(0.05))(2)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-type 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(b) approximate to 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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