Splayed configurations of columnar defects in YBa2Cu3O7, (Ti,Bi)Sr2CaCu2O7 and Bi2Sr2CaCu2O8 single crystals - Study of the enhanced pinning efficiencies for different characteristic angles

被引：45

作者：

Hardy, V ^{[1
]}

Ruyter, A ^{[1
]}

Wahl, A ^{[1
]}

Maignan, A ^{[1
]}

Groult, D ^{[1
]}

Provost, J ^{[1
]}

Simon, C ^{[1
]}

Noel, H ^{[1
]}

机构：

[1] UNIV RENNES,LCSIM,CNRS,URA 1495,F-35042 RENNES,FRANCE

来源：

PHYSICA C | 1996年 / 257卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(95)00687-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Splayed configurations of columnar defects with different characteristic angles theta(i) relative to the c-axis have been achieved in single crystals of YBCO, (Tl, Bi)-1212 and Bi-2212. Their pinning efficiencies for H parallel to c have been studied by magnetic measurements. An increased pinning efficiency consistent with the splayed model of Hwa et al. [Phys. Rev. Lett. 71 (1993) 3545] has been observed with theta(i) = 10 degrees for YBCO and (T1, Bi)-1212. On the other hand, the effect is detrimental for the more anisotropic compound Bi-2212. Moreover, higher angles up to theta(i) = 75 degrees have yielded further pinning improvements in all the compounds for high temperatures and low fields, but these latter results are more delicate to interpret.

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页码：16 / 24

页数：9

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