Strong-coupling superconductivity in NaFe1-xCoxAs: Validity of Eliashberg theory

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	Strong-coupling superconductivity in NaFe1-xCoxAs: Validity of Eliashberg theory
	Tan, GT ; Zheng, P ; Wang, XC ; Chen, YC ; Zhang, XT ; Luo, JL ; Netherton, T ; Song, Y ; Dai, PC ; Zhang, CL ; Li, SL
刊名	PHYSICAL REVIEW B
	2013
卷号	87 期号:14
ISSN号	1098-0121
通讯作者	Tan, GT (reprint author), Beijing Normal Univ, Beijing 100875, Peoples R China.
中文摘要	We study the normal-state and superconducting properties of the NaFe1-xCox As system by specific heat measurements. Both the normal-state Sommerfeld coefficient and superconducting condensation energy are strongly suppressed in the underdoped and heavily overdoped samples. The low-temperature electronic specific heat can be well fitted by either a one-gap or a two-gap BCS-type function for all the superconducting samples. The ratio T-gamma N(c)2/H-c(2)(0) can nicely associate the neutron spin resonance as the bosons in the standard Eliashberg model. However, the value of Delta C/T-c gamma N near optimal doping is larger than the maximum value the model can obtain. Our results suggest that the high-T-c superconductivity in the Fe-based superconductors may be understood within the framework of boson-exchange mechanism but significant modification may be needed to account for the finite-temperature properties. DOI: 10.1103/PhysRevB.87.144512
资助信息	Chinese Academy of Science, 973 Program [2010CB833102, 2010CB923002, 2012CB821400, 2011CB921701]; US DOE BES [DE-FG02-05ER46202]
语种	英语
公开日期	2014-01-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57483]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Tan, GT,Zheng, P,Wang, XC,et al. Strong-coupling superconductivity in NaFe1-xCoxAs: Validity of Eliashberg theory[J]. PHYSICAL REVIEW B,2013,87(14).
APA	Tan, GT.,Zheng, P.,Wang, XC.,Chen, YC.,Zhang, XT.,...&Li, SL.(2013).Strong-coupling superconductivity in NaFe1-xCoxAs: Validity of Eliashberg theory.PHYSICAL REVIEW B,87(14).
MLA	Tan, GT,et al."Strong-coupling superconductivity in NaFe1-xCoxAs: Validity of Eliashberg theory".PHYSICAL REVIEW B 87.14(2013).