Strong-coupling superconductivity in the nickel-based oxypnictide LaNiAsO(1-x)F(x)

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	Strong-coupling superconductivity in the nickel-based oxypnictide LaNiAsO(1-x)F(x)
	Li, Z ; Chen, GF ; Dong, J ; Li, G ; Hu, WZ ; Wu, D ; Su, SK ; Zheng, P ; Xiang, T ; Wang, NL ; Luo, JL
刊名	PHYSICAL REVIEW B
	2008
卷号	78 期号:6
关键词	LAYERED SUPERCONDUCTOR HEAT MEASUREMENTS LOW-TEMPERATURE INSTABILITY FIELD
ISSN号	1098-0121
通讯作者	Li, Z (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	A series of layered nickel-based LaNiAsO(1-x)F(x) compounds with x=0-0.15 are synthesized by solid-state reactions. The pure LaNiAsO exhibits bulk superconductivity with T(c)similar to 2.75 K. Partial substitution of oxygen with fluorine increases the transition temperature to similar to 3.8 K. The LaNiAsO(0.9)F(0.1) sample shows a sharp superconducting transition and a sharp specific-heat jump at the critical temperature. The magnitude of the specific-heat jump is much larger than that expected from the weak-coupling BCS theory, indicating that this superconductor is in the strong-coupling regime. Furthermore, the temperature dependence of the specific heat deviates strongly from the theoretical result for the single-band s- or d-wave superconductor but shows a characteristic feature of multigap.
收录类别	SCI
资助信息	NSF of China; Chinese Academy of Sciences; MOST, China [973]
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/53181]
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	Li, Z,Chen, GF,Dong, J,et al. Strong-coupling superconductivity in the nickel-based oxypnictide LaNiAsO(1-x)F(x)[J]. PHYSICAL REVIEW B,2008,78(6).
APA	Li, Z.,Chen, GF.,Dong, J.,Li, G.,Hu, WZ.,...&Luo, JL.(2008).Strong-coupling superconductivity in the nickel-based oxypnictide LaNiAsO(1-x)F(x).PHYSICAL REVIEW B,78(6).
MLA	Li, Z,et al."Strong-coupling superconductivity in the nickel-based oxypnictide LaNiAsO(1-x)F(x)".PHYSICAL REVIEW B 78.6(2008).