Physics – Condensed Matter – Superconductivity
Scientific paper
2010-03-26
Phys. Rev. B 81, 104528 (2010)
Physics
Condensed Matter
Superconductivity
10 pages, 10 figures, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.81.104528
We investigated the optical spectrum of Ba(Fe1-xCox)2As2 single crystals with various doping levels. It is found that the low-energy optical conductivity spectrum of this system can be decomposed into two components: a sharp Drude term and a broad "incoherent" term. For the compounds showing magnetic order, a gap appears predominantly in the "incoherent" component, while an s-wave like superconducting gap opens in both components for highly doped compounds. The Drude weight steadily increases as doping proceeds, consistent with electron doping in this system. On the other hand, the "incoherent" spectral weight is almost doping independent, but its spectral feature is intimately connected with the magnetism. We demonstrate that the presence of two distinct components in the optical spectrum well explains the doping and temperature dependences of the dc resistivity.
Eisaki Hiroshi
Ishida Satomi
Ito Tetsuya
Iyo Akira
Kihou Kunihiro
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