Enhanced critical current properties in Ba0.6K0.4+xFe2As2 superconductor by overdoping of potassium

被引：24

作者：

Wang, Chunlei ^{[1
]}

Wang, Lei ^{[1
]}

Gao, Zhaoshun ^{[1
]}

Yao, Chao ^{[1
]}

Wang, Dongliang ^{[1
]}

Qi, Yanpeng ^{[1
]}

Zhang, Xianping ^{[1
]}

Ma, Yanwei ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Elect Engn, Key Lab Appl Superconduct, Beijing 100190, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2011年 / 98卷 / 04期

基金：

中国国家自然科学基金;

关键词：

MGB2;

D O I：

10.1063/1.3549195

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Phase-pure polycrystalline Ba0.6K0.4+xFe2As2 with 0 <= x <= 0.1 were prepared using a one-step solid-state reaction method. We found that overdoping of potassium can improve the critical current density (J(c)). High-field J(c) for samples with x=0.1 is three times higher than that for samples with x=0. Overdoping of K has minimal effect on the critical transition temperature (T-c). Less than 0.5 K degradations in T-c was measured for samples with x=0.1. Transmission electron microscopy (TEM) revealed high concentration of dislocations in samples with x=0.1, resulting in enhanced flux pining. Further analyses on magnetization loops for powder samples confirm that K overdoping can promote intragrain J(c). Our results indicate that slight excess of K in Ba0.6K0.4Fe2As2 superconductor is beneficial to high-field applications. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3549195]

引用

页数：3

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