Magnetic studies of flux pinning in YBa2Cu3O7-x, YBa2Cu4O8 and Hg-based single crystals

被引：0
|
作者：
Wisniewski, A
Puzniak, R
Szymczak, R
Baran, M
Karpinski, J
机构：
[1] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
[2] ETH Zurich, Festkorperphys Lab, CH-8093 Zurich, Switzerland
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 177卷
关键词：
superconductivity; high T-c; flux pinning; irreversibility line;
D O I：
10.1016/S0304-8853(97)00641-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The flux-pinning mechanism in YBa2Cu3O7-x, (Y-123), YBa2Cu4O8 (Y-124), HgBa2CuO4+x (Hg-1201) and HgBa2Ca2Cu3O8+x (Hg-1223) is compared. Single crystals of Y-123, Y-124 and Hg-1201 show a very pronounced fishtail effect, observed in a wide temperature range. For each compound the irreversibility field and the field at which the peak in the fishtail occurs are well described by a power-law dependence H-in/peak(T) = H-in/peak(0)(1 - T/T-c)(alpha) with very similar exponents. In Hg-1223 the pinning has a more three-dimensional character at higher temperatures, but becomes rather two dimensional at low temperatures. (C) 1998 Elsevier Science B.V. All rights reserved.
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收藏
页码：499 / 501
页数：3
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