The Ic(B) behavior of MgB2 composite with ferromagnetic sheath

被引：6
作者：
Kovác, P
Ahoranta, M
Lehtonen, J
Husek, I
机构：
[1] Slovak Acad Sci, Inst Elect Engn, Dept Superconductor Phys, Bratislava 84236, Slovakia
[2] Tampere Univ Technol, Inst Electromagnet, FIN-33101 Tampere, Finland
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2003年 / 397卷 / 1-2期
关键词：
D O I：
10.1016/S0921-4534(03)01303-0
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Single core MgB2 composites have been made by the powder-in-tube method using commercial MgB2 powder (Alfa Aesar) and Fe or Cu sheath. Transport currents of as-deformed tapes were measured at 4.2 K and external magnetic fields B = 0-6 T. A different I-c(B) curves were measured for Fe and Cu sheathed tapes. This behavior is attributed to the Fe sheath magnetization by self-field and external field. Field distribution in the conductor cross section was analysed with the finite element method. The results were in agreement with the measurements. The presence of ferromagnetic layer in MgB2 composite influence also the pinning curves and Kramer's plots derived from measured data. This phenomenon has to be taken into account when the basic superconducting characteristics of the composite (wires/tapes) with magnetic sheaths are described and discussed. (C) 2003 Elsevier B.V. All rights reserved.
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页码：14 / 18
页数：5
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