Enhancement of the point defect pinning effect in Mo-doped Bi2212 single crystals of reduced anisotropy

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Abstract
High quality Bi2Sr2CaCu2−xMoxOy (x = 0, 0.01 and 0.02) single crystals have been grown by a self-flux method in a horizontal temperature gradient and their flux pinning and irreversibility behaviour have been investigated. The irreversibility lines of the undoped and Mo-doped Bi2212 crystals have been greatly improved by reducing the anisotropy parameter γ. However, this improvement is much more pronounced for Mo-doped crystals than for the undoped ones. The peak effect of magnetization loops also changes with both Mo-doping and γ. The results provide strong evidence that the point defect pinning served by Mo is greatly enhanced when the anisotropy of the system is reduced.
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Author(s)
Han, S H
Cheng, C H
Dai, Y
Zhang, Y
Zhang, H
Zhao, Yong
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Publication Year
2002
Resource Type
Journal Article
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UNSW Faculty