Thermal conductivity of overdoped BaFe1.73Co0.27As2 single crystal: Evidence for nodeless multiple superconducting gaps and interband interactions

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	Thermal conductivity of overdoped BaFe1.73Co0.27As2 single crystal: Evidence for nodeless multiple superconducting gaps and interband interactions
	Dong, JK ; Zhou, SY ; Guan, TY ; Qiu, X ; Zhang, C ; Cheng, P ; Fang, L ; Wen, HH ; Li, SY
刊名	PHYSICAL REVIEW B
	2010
卷号	81 期号:9
关键词	RESOLVED PHOTOEMISSION-SPECTROSCOPY LAYERED SUPERCONDUCTOR BA0.6K0.4FE2AS2 SYMMETRY
ISSN号	1098-0121
通讯作者	Dong, JK (reprint author), Fudan Univ, Dept Phys, Surface Phys Lab Natl Key Lab, Shanghai 200433, Peoples R China.
中文摘要	The in-plane thermal conductivity kappa of overdoped FeAs-based superconductor BaFe1.73Co0.27As2 (T-c=8.1 K) single crystal was measured down to 80 mK. In zero field, the residual linear term kappa(0)/T is negligible, suggesting a nodeless superconducting gap in the ab plane. In magnetic field, kappa(0)/T increases rapidly, very different from that of conventional s-wave superconductors. This anomalous kappa(0)/T(H) may reveal an exotic superconducting gap structure in overdoped BaFe1.73Co0.27As2: the vanishing hole (beta) pocket has a much larger gap than the electron (gamma and delta) pockets which contain most of the carriers. Such an exotic gap structure is an evidence for superconducting state induced by interband interactions, in which the band with the smaller density of states has a larger gap.
收录类别	SCI
资助信息	Natural Science Foundation of China; Ministry of Science and Technology of China [2009CB929203, 2006CB601000]; Program for New Century Excellent Talents in University; STCSM of China [08dj1400200, 08PJ1402100]
语种	英语
公开日期	2013-09-23
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/45710]
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	Dong, JK,Zhou, SY,Guan, TY,et al. Thermal conductivity of overdoped BaFe1.73Co0.27As2 single crystal: Evidence for nodeless multiple superconducting gaps and interband interactions[J]. PHYSICAL REVIEW B,2010,81(9).
APA	Dong, JK.,Zhou, SY.,Guan, TY.,Qiu, X.,Zhang, C.,...&Li, SY.(2010).Thermal conductivity of overdoped BaFe1.73Co0.27As2 single crystal: Evidence for nodeless multiple superconducting gaps and interband interactions.PHYSICAL REVIEW B,81(9).
MLA	Dong, JK,et al."Thermal conductivity of overdoped BaFe1.73Co0.27As2 single crystal: Evidence for nodeless multiple superconducting gaps and interband interactions".PHYSICAL REVIEW B 81.9(2010).