Fishtail and vortex dynamics in the Ni-doped iron pnictide BaFe1.82Ni0.18As2

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	Fishtail and vortex dynamics in the Ni-doped iron pnictide BaFe1.82Ni0.18As2
	Salem-Sugui, S ; Ghivelder, L ; Alvarenga, AD ; Cohen, LF ; Luo, HQ ; Lu, XY
刊名	PHYSICAL REVIEW B
	2011
卷号	84 期号:5
关键词	HIGH-TEMPERATURE SUPERCONDUCTORS CREEP ACTIVATION-ENERGY FLUX-CREEP MAGNETIC-RELAXATION DEPENDENCE
ISSN号	1098-0121
通讯作者	Salem-Sugui, S: Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil.
中文摘要	We study the vortex dynamics of a BaFe1.82Ni0.18As2 crystal with T-c = 8 K by measuring flux creep over the second magnetization (or fishtail) peak for both H parallel to c axis and H parallel to ab planes. Magnetic relaxation data show an anomalously long initial stage of relaxation, lasting similar to 10 min for the H parallel to c axis and 2-3 min for H parallel to ab, resembling a transient effect with a lower relaxation rate, which is followed by the usual log(time) relaxation. Interestingly, study of the relaxation rate R vs H for both stages of relaxation and for both field directions are featureless over the field range associated with the fishtail. The same trend was confirmed by plotting R vs T obtained from flux-creep data measured as a function of temperature for a fixed field (H parallel to c axis). A plot of the activation energy U(M, T) calculated from the time of relaxation of the magnetization at a fixed field also shows a smooth behavior, further supporting the view that the fishtail peak is not associated with a crossover in a vortex pinning regime within the collective pinning scenario.
收录类别	SCI
资助信息	Brazilian agency CNPq; Brazilian agency FAPERJ; UK Funding Council [EP/H040048]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/38275]
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	Salem-Sugui, S,Ghivelder, L,Alvarenga, AD,et al. Fishtail and vortex dynamics in the Ni-doped iron pnictide BaFe1.82Ni0.18As2[J]. PHYSICAL REVIEW B,2011,84(5).
APA	Salem-Sugui, S,Ghivelder, L,Alvarenga, AD,Cohen, LF,Luo, HQ,&Lu, XY.(2011).Fishtail and vortex dynamics in the Ni-doped iron pnictide BaFe1.82Ni0.18As2.PHYSICAL REVIEW B,84(5).
MLA	Salem-Sugui, S,et al."Fishtail and vortex dynamics in the Ni-doped iron pnictide BaFe1.82Ni0.18As2".PHYSICAL REVIEW B 84.5(2011).