Confinement of fluxons by surface columnar defects in Bi1.8Pb0.33Sr1.87Ca2Cu3Oy tapes

被引：32

作者：

Mezzetti, E

Gerbaldo, R

Ghigo, G

Gozzelino, L

Gherardi, L

机构：

[1] Politecn Torino, Ist Nazl Fis Mat, UDR Torino, Ist Nazl Fis Nucl,Sezione Torino, I-10129 Turin, Italy

[2] Pirelli Cavi SPA, I-20126 Milan, Italy

来源：

PHYSICAL REVIEW B | 1999年 / 59卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.59.3890

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the effects of surface columnar defects created along about 5% of the sample thickness by means of 0.25 GeV Au ions at different doses on Bi1.8Pb0.33Sr1.87Ca2Cu3Oy high-quality tapes on the vortex dynamics in the sample bulk. Strong phenomena of vortex localization inside the bulk are revealed by shifts of the irreversibility lines (IL's) as well as by their after-irradiation shape. The enhanced IL's exhibit specific characteristics, such as a Bose-glass-like behavior up to quite high fields, with a dose-dependent onset point. Moreover, the irreversible regime expands with decreasing defect density. Such results are consistent with the setting up of confined vortices morphologies. Experimental data concerning the IL with the field orthogonal to the columnar defect direction as well as critical current density enhancements are also reported and discussed. [S0163-1829(99)01205-9].

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页码：3890 / 3895

页数：6

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