A defect detection method for MgB2 superconducting and iron-based Ba(Fe,Co)2As2 wires

被引：22

作者：

Gajda, D. ^{[1
]}

Morawski, A. ^{[2
]}

Zaleski, A. ^{[3
]}

Yamamoto, A. ^{[4
]}

Cetner, T. ^{[2
]}

机构：

[1] Int Lab High Magnet Field & Low Temp, Gajowicka 95, PL-53421 Wroclaw, Poland

[2] PAS, Inst High Pressure Phys, Sokolowska 29-37, PL-01142 Warsaw, Poland

[3] Polish Acad Sci, Inst Low Temp & Struct Res, Okolna 2, PL-50422 Wroclaw, Poland

[4] Tokyo Univ Agr & Technol, Dept Appl Phys, 2-24-16 Nakacyou, Koganei, Tokyo 1848588, Japan

来源：

APPLIED PHYSICS LETTERS | 2016年 / 108卷 / 15期

关键词：

DAMAGE; JUMP;

D O I：

10.1063/1.4947056

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this article, a method allowing for the detection of damage in iron-based superconducting bulks and MgB2 wires is presented. MgB2 wires were made of in situ material with ex situ MgB2 barrier. The iron superconductor studied was Ba(Fe, Co)(2)As-2. This material was surrounded by Nb barrier and placed inside an iron tube. All samples were annealed in the isostatic pressure of 1 GPa. Transport measurements were made using a four-contact probe. The transition of Nb and ex situ MgB2 barrier from superconducting into resistive state (first transition) was observed at a temperature range from 5K to 10K and can be attributed to damage in either the Nb or ex situ MgB2 barrier in these samples. For samples with a damaged barrier, it was not possible to determine the critical current density of the wires. The analysis indicates that annealing at 1 GPa leads to the Ba(Fe, Co)(2)As-2 material with critical temperatures of 27K and 21.5K at upper critical flux density (B-c2) of 14T. Published by AIP Publishing.

引用

页数：4

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