Flux pinning mechanism in BaFe1.9Ni0.1As2 single crystals: Evidence for fluctuation in mean free path induced pinning

被引：34

作者：

Shahbazi, M. ^{[1
]}

Wang, X. L. ^{[1
]}

Choi, K. Y. ^{[2
]}

Dou, S. X. ^{[1
]}

机构：

[1] Univ Wollongong, Inst Superconducting & Elect Mat, North Wollongong, NSW 2519, Australia

[2] Seoul Natl Univ, Ctr Novel States Complex Mat Res, Dept Phys & Astron, Seoul 151747, South Korea

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 03期

基金：

澳大利亚研究理事会;

关键词：

VORTEX-LATTICE; SUPERCONDUCTIVITY; MAGNETIZATION; YBA2CU3O7-DELTA; PHASE;

D O I：

10.1063/1.4813113

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The flux pinning mechanism of BaFe1.9Ni0.1As2 superconducting crystals have been investigated systematically by magnetic measurements up to 13 T at various temperatures. The field dependence of the critical current density, J(c), was analysed within the collective pinning model. A remarkably good agreement between the experimental results and theoretical delta l pinning curve is obtained, which indicates that pinning in BaFe1.9Ni0.1As2 crystal originates from spatial variation of the mean free path. Moreover, the normalized pinning force density, F-p, curves versus h = B/B-irr (B-irr is the irreversibility field) were scaled using the Dew-Hughes model. Analysis suggests that point pinning alone cannot explain the observed field variation of F-p. (C) 2013 AIP Publishing LLC.

引用

页数：4

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