Evidence for vortex pinning induced by fluctuations in the transition temperature of MgB2 superconductors -: art. no. 132508

被引：79
|
作者：
Qin, MJ [1 ]
Wang, XL [1 ]
Liu, HK [1 ]
Dou, SX [1 ]
机构：
[1] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia
来源：
PHYSICAL REVIEW B | 2002年 / 65卷 / 13期
关键词：
D O I：
10.1103/PhysRevB.65.132508
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The field-dependent critical current density j(c)(B) of a MgB2 bulk sample has been obtained using magnetic measurements. The j(c)(B) curves at different temperatures demonstrate a crossover from single vortex pinning to small-bundle vortex pinning, when the field is larger than the crossover field B-sb. The temperature dependence of B-sb(T) is in agreement with a model of randomly distributed weak pinning centers via the spatial fluctuations of the transition temperature (deltaT(c) pinning), while pinning due to the mean-free-path fluctuations (deltal pinning) is not observed.
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页码：1 / 4
页数：4
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