Direct measurement of the temperature dependence of the magnetic penetration depth in Ba(Fe1-xNix)(2)As-2 superconductors

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	Direct measurement of the temperature dependence of the magnetic penetration depth in Ba(Fe1-xNix)(2)As-2 superconductors
	Rey, RI ; Ramos-Alvarez, A ; Mosqueira, J ; Salem-Sugui, S ; Alvarenga, AD ; Luo, HQ ; Lu, XY ; Zhang, R ; Vidal, F
刊名	SUPERCONDUCTOR SCIENCE & TECHNOLOGY
	2014
卷号	27 期号:5
关键词	Fe-based superconductors penetration depth pairing symmetry doping level
ISSN号	0953-2048
通讯作者	Rey, RI (reprint author), Univ Santiago Compostela, Fac Fis, LBTS, E-15782 Santiago De Compostela, Spain.
中文摘要	The temperature dependence of the in-plane magnetic penetration depth lambda(ab) of Ba(Fe1-xNix)(2)As-2 single crystals is determined directly from the shielding magnetic susceptibility, measured in the Meissner region with the field parallel to the ab layers. The doping levels studied cover the underdoped, optimally doped and overdoped regimes. At temperatures below 0.5T(c) a well-defined power-law behavior lambda(ab)(T) - lambda(ab) (0) = AT(n) (with n approximate to 2.5) is observed. At lower temperatures (T < 0.3T(c)) the data are still consistent with n = 2 and A alpha T-c(-3), as predicted by the strong pair-breaking scenario proposed by Gordon et al (2010 Phys. Rev. B 81, 180501(R)). The temperature dependence of the superfluid density rho(s) alpha lambda(-2)(ab) presents a marked positive curvature just below T-c, which is a sign of two-gap superconductivity. The analysis of rho(s) (T) in terms of a two-gap model allowed estimation of parameters like the in-band and inter-band couplings, the relative weight of each band, and their dependence on the doping level. A comparison with rho(s) (T) data obtained by using other techniques in compounds with a similar composition is also presented.
资助信息	Spanish MICINN; ERDF [FIS2010-19807]; Xunta de Galicia [2010/XA043, 10TMT206012PR]; CNPq; FAPERJ; NSFC Program [11374011]; MOST of China [2011CBA00110]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59761]
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	Rey, RI,Ramos-Alvarez, A,Mosqueira, J,et al. Direct measurement of the temperature dependence of the magnetic penetration depth in Ba(Fe1-xNix)(2)As-2 superconductors[J]. SUPERCONDUCTOR SCIENCE & TECHNOLOGY,2014,27(5).
APA	Rey, RI.,Ramos-Alvarez, A.,Mosqueira, J.,Salem-Sugui, S.,Alvarenga, AD.,...&Vidal, F.(2014).Direct measurement of the temperature dependence of the magnetic penetration depth in Ba(Fe1-xNix)(2)As-2 superconductors.SUPERCONDUCTOR SCIENCE & TECHNOLOGY,27(5).
MLA	Rey, RI,et al."Direct measurement of the temperature dependence of the magnetic penetration depth in Ba(Fe1-xNix)(2)As-2 superconductors".SUPERCONDUCTOR SCIENCE & TECHNOLOGY 27.5(2014).