HOMOGENEOUS AND FRACTAL BEHAVIOR OF SUPERCONDUCTING FLUCTUATIONS IN THE ELECTRICAL-RESISTIVITY OF GRANULAR CERAMIC SUPERCONDUCTORS

被引：26

作者：

AUSLOOS, M ^{[1
]}

CLIPPE, P ^{[1
]}

LAURENT, C ^{[1
]}

机构：

[1] STATE UNIV LIEGE,INST MONTEFIORE,SUPRAS,B-4000 LIEGE,BELGIUM

来源：

PHYSICAL REVIEW B | 1990年 / 41卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.41.9506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Experimental data show that the electrical-resistivity temperature derivative diverges in a different manner in the granular ceramic superconductors YBa2Cu3O7-y and Bi1.75Pb0.25Ca2Sr2Cu3O10-y. Critical exponents are extracted and explained. The dimensionality of anomalous superconductivity fluctuations is deduced. A homogeneous case and a self-similar (fractal) behavior can occur and are found. They correspond to different values of the superconductivity s and some percolation p coherence-length ratio. The results indicate that superconductivity percolation is achieved through surface connection rather than through path connection. © 1990 The American Physical Society.

引用

页码：9506 / 9509

页数：4

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