NMR Study of Superconductivity and Spin Fluctuations in Hole-Doped Superconductor Ca1-xNaxFe2As2 (T-c=32 K)

	NMR Study of Superconductivity and Spin Fluctuations in Hole-Doped Superconductor Ca1-xNaxFe2As2 (T-c=32 K)
	Ma, L ; Zhang, JS ; Wang, DM ; He, JB ; Xia, TL ; Chen, GF ; Yu, WQ
刊名	CHINESE PHYSICS LETTERS
	2012
卷号	29 期号:6
关键词	GAPS RELAXATION
ISSN号	0256-307X
通讯作者	Yu, WQ (reprint author), Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China.
中文摘要	We report both Na-23 and As-75 nuclear magnetic resonance (NMR) studies on hole-doped Ca1-xNaxFe2As2 superconducting single crystals (x approximate to 0.67) with the superconducting temperature T-c = 32 K. Singlet superconductivity is suggested by a sharp drop of the Knight shift K-75 below T-c. The spin-lattice relaxation rate 1/T-1 does not show the Slichter-Hebel coherence peak, which suggests an unconventional pairing. The penetration depth is estimated to be 0.24 mu m at temperature T = 2 K. Here 1/(T1T)-T-75 shows an anisotropic behavior and a prominent low-temperature upturn, with T-75(1) denoting the As-75 spin-lattice relaxation time and T the temperature, which indicates strong low-energy antiferromagnetic spin fluctuations and supports a magnetic origin of superconductivity.
收录类别	SCI
资助信息	National Basic Research Program of China [2010CB923004, 2011CBA00112]; National Natural Science Foundation of China [11074304, 11104070, 11004245, 10974254]; Program for New Century Excellent Talents in University [NCET-08-0546]; Fundamental Research Funds for the Central Universities of China
语种	英语
公开日期	2014-02-20
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57803]
专题	物理研究所_所内人员在其他单位发表论文题录信息_所内人员在其他单位发表论文题录信息_期刊论文
推荐引用方式 GB/T 7714	Ma, L,Zhang, JS,Wang, DM,et al. NMR Study of Superconductivity and Spin Fluctuations in Hole-Doped Superconductor Ca1-xNaxFe2As2 (T-c=32 K)[J]. CHINESE PHYSICS LETTERS,2012,29(6).
APA	Ma, L.,Zhang, JS.,Wang, DM.,He, JB.,Xia, TL.,...&Yu, WQ.(2012).NMR Study of Superconductivity and Spin Fluctuations in Hole-Doped Superconductor Ca1-xNaxFe2As2 (T-c=32 K).CHINESE PHYSICS LETTERS,29(6).
MLA	Ma, L,et al."NMR Study of Superconductivity and Spin Fluctuations in Hole-Doped Superconductor Ca1-xNaxFe2As2 (T-c=32 K)".CHINESE PHYSICS LETTERS 29.6(2012).