Temperature dependence of critical current density of Nb3Al multifilamentary wires fabricated by Nb-tube and its improved processes

被引:3
作者
Kuroda, T [1 ]
Murakami, Y
Itoh, K
Yuyama, M
Wada, H
Mao, D
机构
[1] Natl Res Inst Met, Ibaraki 305, Japan
[2] Kobe Steel Ltd, Kobe, Hyogo 65122, Japan
[3] Shanghai Jiao Tong Univ, Shanghai 200030, Peoples R China
关键词
superconducting Nb3Al wires; Nb-tube process; critical current density; temperature scaling law;
D O I
10.1016/S0011-2275(98)00053-8
中图分类号
O414.1 [热力学];
学科分类号
摘要
The superconducting critical current densities of Nb3Al multifilamentary wires made by Nb-tube and its improved process have been measured as a function of temperature from 4 K to 16 K and of applied magnetic field up to 15 T. The critical current density of these wires decreases almost linearly with increasing temperature except the region near the critical temperature in the magnetic field. The upper critical field estimated on the basis of data on the critical current density for a Nb3Al wire made by the improved process is higher than that for a Nb-tube processed one in the entire temperature range. The volume pinning force density of these wires obeys the temperature scaling law well. The critical current density vs, temperature curves can be well reproduced using this relation even in the region near the critical temperature in fields. It is indicated that the critical current density vs. temperature characteristics from OK to the critical temperature may be divided into three temperature regions and the features in each region are discussed within the flux pinning model of the temperature scaling law. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:785 / 789
页数:5
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