Flux-creep activation energy for a BaFe1.9Ni0.1As2 single crystal derived from alternating current susceptibility measurements

被引：5

作者：

Ge, Jun-Yi ^{[1
]}

Li, Lin-Jun ^{[2
,3
]}

Xu, Zhu-An ^{[3
]}

Moshchalkov, Victor V. ^{[1
]}

机构：

[1] Katholieke Univ Leuven, INPAC Inst Nanoscale Phys & Chem, Celestijnenlaan 200D, B-3001 Leuven, Belgium

[2] Natl Univ Singapore, Adv Mat & Graphene Res Ctr 2D, 2 Sci Dr 2, Singapore 117546, Singapore

[3] Zhejiang Univ, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2016年 / 119卷 / 16期

关键词：

CURRENT-DENSITY; AC RESPONSE; SUPERCONDUCTORS; VORTICES; MAGNETIZATION; DEPENDENCE; DIFFUSION; STATE;

D O I：

10.1063/1.4948356

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Systematic ac susceptibility measurements have been performed to investigate the vortex dynamics in a BaFe1.9Ni0.1As2 single crystal as a function of temperature, frequency, ac field amplitude, and dc magnetic field. The complex activation energy U(T, B, j) is derived in the framework of thermally activated flux creep theory and can be expressed in one simple formula. A power law dependence of U similar to B-alpha with alpha = -0.46 is observed. The activation energy reaches 10(4) K at low fields, suggesting strong pinning in the material. The nonlinear function of the activation energy vs. the current density is determined, which has the expression of U alpha j(-0.1). Published by AIP Publishing.

引用

页数：4

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