In-plane optical spectral weight redistribution in the optimally doped Ba0.6K0.4Fe2As2 superconductor

doi:10.1088/1674-1056/23/8/087401

Abstract We performed detailed temperature-dependent optical measurements on optimally doped Ba_0.6K_0.4Fe₂As₂ single crystal. We examine the changes of the in-plane optical conductivity spectral weight in the normal state and the evolution of the superconducting condensate in the superconducting state. In the normal state, the low-frequency spectral weight shows a metallic response with an arctan (T) dependence, indicating a T-linear scattering rate behavior for the carriers. A high energy spectral weight transfer associated with the Hund's coupling occurs from the low frequencies below 4000 cm^-1～ 5000 cm^-1 to higher frequencies up to at least 10⁴ cm^-1. Its temperature dependence analysis suggests that the Hund's coupling strength is continuously enhanced as the temperature is reduced. In the superconducting state, the FGT sum rule is conserved according to the spectral weight estimation within the conduction bands, only about 40% of the conduction bands participates in the superconducting condensate indicating that Ba_0.6K_0.4Fe₂As₂ is in dirty limit.

Keywords: iron-based superconductor infrared spectroscopy optical properties

Received: 14 April 2014
Revised: 29 April 2014
Accepted manuscript online:

PACS:	74.70.Xa	(Pnictides and chalcogenides)
	78.30.-j	(Infrared and Raman spectra)
	74.25.Gz	(Optical properties)

Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2012CB821403, 2011CBA00107, and 2012CB921302) and the National Natural Science Foundation of China (Grant Nos. 11374345, 11104335, and 91121004).

Corresponding Authors: Qiu Xiang-Gang
E-mail: xgqiu@iphy.ac.cn

Cite this article:

Xu Bing (许兵), Dai Yao-Min (戴耀民), Xiao Hong (肖宏), R. P. S. M. Lobo, Qiu Xiang-Gang (邱祥冈) In-plane optical spectral weight redistribution in the optimally doped Ba_0.6K_0.4Fe₂As₂ superconductor 2014 Chin. Phys. B 23 087401

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In-plane optical spectral weight redistribution in the optimally doped Ba0.6K0.4Fe2As2 superconductor

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In-plane optical spectral weight redistribution in the optimally doped Ba_0.6K_0.4Fe₂As₂ superconductor