CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Optical conductivity as a probe of a hidden Fermi-liquidbehavior in BaFe1.904Ni0.096As2 |
Yang Yan-Xing (杨彦兴)a b, Xiong Rui (熊锐)a, Fang Zhi-Hao (方之颢)a, Xu Bing (许兵)b, Xiao Hong (肖宏)b, Qiu Xiang-Gang (邱祥冈)b, Shi Jing (石兢)a, Wang Kai (王凯)b |
a School of Physics and Technology, Wuhan University, Wuhan 430072, China;
b Beijing National Laboratory for Condensed Matter Physics, National Laboratory forSuperconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract We measured the infrared reflectivity of BaFe1.904Ni0.096As2 single crystal from room temperature down to 20 K. Two Drude terms and a Lorentz term well describe the real part of the optical conductivity σ1(ω). We fit the reciprocal of static optical conductivity 1/σ1(0) by the power law ρ(T)=ρ0+ATn with n=1.6. The “broad” Drude component exhibits an incoherent background with a T-independent scattering rate 1/τb, while the other “narrow” one reveals a T-quadratic scattering rate 1/τn, indicating a hidden Fermi-liquid behavior in BaFe1.904Ni0.096As2 compound.
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Received: 17 April 2014
Revised: 28 May 2013
Accepted manuscript online:
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PACS:
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74.70.Xa
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(Pnictides and chalcogenides)
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72.15.-v
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(Electronic conduction in metals and alloys)
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78.30.-j
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(Infrared and Raman spectra)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11374345, 11104335, and 91121004) and the National Basic Research Program of China (Grant Nos. 2012CB821403, 2011CBA00107, and 2012CB921302). |
Corresponding Authors:
Xiong Rui,Wang Kai
E-mail: xiongrui@whu.edu.cn;wangkai@iphy.ac.cn
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About author: 74.70.Xa; 72.15.-v; 78.30.-j |
Cite this article:
Yang Yan-Xing (杨彦兴), Xiong Rui (熊锐), Fang Zhi-Hao (方之颢), Xu Bing (许兵), Xiao Hong (肖宏), Qiu Xiang-Gang (邱祥冈), Shi Jing (石兢), Wang Kai (王凯) Optical conductivity as a probe of a hidden Fermi-liquidbehavior in BaFe1.904Ni0.096As2 2014 Chin. Phys. B 23 107401
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