Optical conductivity as a probe of a hidden Fermi-liquidbehavior in BaFe1.904Ni0.096As2

doi:10.1088/1674-1056/23/10/107401

Abstract We measured the infrared reflectivity of BaFe_1.904Ni_0.096As₂ 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/τ_b, while the other “narrow” one reveals a T-quadratic scattering rate 1/τ_n, indicating a hidden Fermi-liquid behavior in BaFe_1.904Ni_0.096As₂ compound.

Keywords: iron-based superconductor Fermi liquid optical conductivity

Received: 17 April 2014
Revised: 28 May 2013
Accepted manuscript online:

PACS:	74.70.Xa	(Pnictides and chalcogenides)
	72.15.-v	(Electronic conduction in metals and alloys)
	78.30.-j	(Infrared and Raman spectra)

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

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 BaFe_1.904Ni_0.096As₂ 2014 Chin. Phys. B 23 107401


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Optical conductivity as a probe of a hidden Fermi-liquidbehavior in BaFe1.904Ni0.096As2

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Optical conductivity as a probe of a hidden Fermi-liquidbehavior in BaFe_1.904Ni_0.096As₂