Magnetic-field angle dependent critical current densities and flux pinning in commercial YBCO tapes below liquid nitrogen temperatures
Magnetic-field angle dependent critical current densities and flux pinning in commercial YBCO tapes below liquid nitrogen temperatures
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DOI：
10.1016/j.physc.2011.05.113
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发表时间：
2011-11-01
影响因子：
1.7
通讯作者：
Furuse, M.
中科院分区：
文献类型：
--
作者：
Lee, Y.;Yamasaki, H.;Furuse, M.
我们研究了用MOCVD方法制备的YBCO和掺Zr(GdY)BCO带材的临界电流密度(J(C))随磁场强度(J(C))的变化关系。在80~20K的温度范围内，磁场(Mu H-0)最高可达5T。对于YBCO带材，观察到小于2Xi(T)(Xi(T)是温度T时的Ginzburg-Landau相干长度)的随机钉扎对磁通钉扎的贡献随着T的降低而减小，但即使在20K时它们仍然很重要。随着温度的下降，H平行于ab的峰变得越来越尖锐。这与Tchiki-Takahashi的本征钉扎模型非常吻合。与YBCO带材相比，掺Zr的(GdY)BCO带材在H平行于c和H平行于ab附近出现了峰，并且表现出更好的场J(C)特性。(C)2011爱思唯尔B.V.保留所有权利。
We investigated the magnetic-field angle dependence of critical current densities (J(c)) for commercial YBCO and Zr-doped (GdY)BCO tapes fabricated by an MOCVD method at temperatures from 80 K down to 20 K in fields (mu H-0) up to 5 T. For the YBCO tape it was observed that the flux pinning contribution from random pins smaller than 2 xi(T) (xi(T) is the Ginzburg-Landau coherence length at temperature T) diminished as T decreased, while they were still important even at 20 K. As the temperature went down, the peaks at H parallel to ab were found to be increasingly sharp, which agrees well with the Tachiki-Takahashi intrinsic pinning model. The Zr-doped (GdY)BCO tape showed peaks near H parallel to c as well as H parallel to ab and exhibited improved in-field J(c) properties, compared with the YBCO tape. (C) 2011 Elsevier B.V. All rights reserved.