Strong pinning and elastic to plastic vortex crossover in Na-doped CaFe2As2 single crystals

	Strong pinning and elastic to plastic vortex crossover in Na-doped CaFe2As2 single crystals
	Haberkorn, N ; Miura, M ; Maiorov, B ; Chen, GF ; Yu, W ; Civale, L
刊名	PHYSICAL REVIEW B
	2011
卷号	84 期号:9
关键词	HIGH-TEMPERATURE SUPERCONDUCTORS CREEP
ISSN号	1098-0121
通讯作者	Haberkorn, N (reprint author), Los Alamos Natl Lab, MPA STC, POB 1663, Los Alamos, NM 87545 USA.
中文摘要	We study the vortex dynamics of NaxCa1-xFe2As2 single crystals with x = 0.5 (underdoped) and x = 0.75 (optimally doped), having T-c approximate to 19.4 and 33.4 K, respectively, by performing magnetization measurements of the critical current density J(c) and flux creep rate S. We find that the J(c) versus temperature, T, dependence is consistent with delta T-c pinning, indicating strong pinning associated with randomly distributed defects larger than the coherence length xi. The temperature dependence of S shows a crossover between glassy (elastic) and plastic creep regimes. The boundary T-cr(H) between both creep regimes coincides with the upper limit of the regime of strong pinning by nanoparticles. The glassy exponent mu in the optimally doped crystal is consistent with the thermal collective creep theory previously applied to cuprate superconductors, but in the underdoped sample the plateau in S(T) indicates that mu approximate to 3-3.3, a value larger than the existing theoretical predictions. We discuss the quantum creep contributions in both samples.
收录类别	SCI
资助信息	US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering; NSFC [10974254, 11074304]; National Basic Research Program of China [2010CB923000, 2011CBA00100]
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/311004/57806]
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	Haberkorn, N,Miura, M,Maiorov, B,et al. Strong pinning and elastic to plastic vortex crossover in Na-doped CaFe2As2 single crystals[J]. PHYSICAL REVIEW B,2011,84(9).
APA	Haberkorn, N,Miura, M,Maiorov, B,Chen, GF,Yu, W,&Civale, L.(2011).Strong pinning and elastic to plastic vortex crossover in Na-doped CaFe2As2 single crystals.PHYSICAL REVIEW B,84(9).
MLA	Haberkorn, N,et al."Strong pinning and elastic to plastic vortex crossover in Na-doped CaFe2As2 single crystals".PHYSICAL REVIEW B 84.9(2011).