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

Article

关键词: FERMI-LIQUID BEHAVIOR;    OPTICAL-PROPERTIES;    CRITICAL-POINTS;    SPECTROSCOPY;    INSTABILITY;    ORDER;    HEAT;   

DOI  :  10.1103/PhysRevB.82.054518

来源: SCIE

【 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.

【 授权许可】

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