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

被引：70
作者：
Barisic, N. [1 ]
Wu, D. [1 ]
Dressel, M. [1 ]
Li, L. J. [2 ]
Cao, G. H. [2 ]
Xu, Z. A. [2 ]
机构：
[1] Univ Stuttgart, Inst Phys 1, D-70550 Stuttgart, Germany
[2] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China
来源：
PHYSICAL REVIEW B | 2010年 / 82卷 / 05期
关键词：
FERMI-LIQUID BEHAVIOR; OPTICAL-PROPERTIES; CRITICAL-POINTS; SPECTROSCOPY; INSTABILITY; ORDER; HEAT;
D O I：
10.1103/PhysRevB.82.054518
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The electrodynamic properties of Ba(Fe0.92Co0.08)(2)As-2 and Ba(Fe0.95Ni0.05)(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.
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页数：12
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