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

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

中国物理B ›› 2014, Vol. 23 ›› Issue (8): 87401-087401.doi: 10.1088/1674-1056/23/8/087401

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

许兵^{a b}, 戴耀民^{a b}, 肖宏^a, R. P. S. M. Lobo^b, 邱祥冈^a

a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b LPEM, ESPCI-ParisTech, CNRS, UPMC, 10 rue Vauquelin, F-75231 Paris Cedex 5, France

收稿日期:2014-04-14 修回日期:2014-04-29 出版日期:2014-08-15 发布日期:2014-08-15
基金资助:
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).

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

Xu Bing (许兵)^{a b}, Dai Yao-Min (戴耀民)^{a b}, Xiao Hong (肖宏)^a, R. P. S. M. Lobo^b, Qiu Xiang-Gang (邱祥冈)^a

a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b LPEM, ESPCI-ParisTech, CNRS, UPMC, 10 rue Vauquelin, F-75231 Paris Cedex 5, France

Received:2014-04-14 Revised:2014-04-29 Online:2014-08-15 Published:2014-08-15
Contact: Qiu Xiang-Gang E-mail:xgqiu@iphy.ac.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: iron-based superconductor, infrared spectroscopy, optical properties

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.

Key words: iron-based superconductor, infrared spectroscopy, optical properties

中图分类号: (Pnictides and chalcogenides)

74.70.Xa

78.30.-j (Infrared and Raman spectra) 74.25.Gz (Optical properties)

许兵, 戴耀民, 肖宏, R. P. S. M. Lobo, 邱祥冈. In-plane optical spectral weight redistribution in the optimally doped Ba_0.6K_0.4Fe₂As₂ superconductor[J]. 中国物理B, 2014, 23(8): 87401-087401.

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[J]. Chin. Phys. B, 2014, 23(8): 87401-087401.

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

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

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