SUPERCONDUCTIVITY FLUCTUATIONS IN BI(PB) BASED GRANULAR CERAMICS SUPERCONDUCTORS - EVIDENCE FOR FRACTAL BEHAVIOR

被引：27

作者：

AUSLOOS, M

LAURENT, C

PATAPIS, SK

POLITIS, C

LUO, HL

GODELAINE, PA

GILLET, F

DANG, A

CLOOTS, R

机构：

[1] STATE UNIV LIEGE, INST ELECT MONTEFIORE B28, SUPRAS, B-4000 LIEGE, BELGIUM

[2] UNIV ATHENS, DIV SOLID STATE, GR-10680 ATHENS, GREECE

[3] KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH, INST NUKL FESTKORPERPHYS, W-7500 KARLSRUHE 1, GERMANY

[4] STATE UNIV LIEGE, INST CHIM B6, SUPRAS, B-4000 LIEGE, BELGIUM

[5] UNIV CALIF SAN DIEGO, DEPT ELECT & COMP ENGN, LA JOLLA, CA 92093 USA

来源：

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1991年 / 83卷 / 03期

关键词：

D O I：

10.1007/BF01313405

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report precise measurements of the electrical resistivity in three different Bi(Pb) based granular ceramics superconductors. We show that a single critical exponent (5/6) describes the superconductivity fluctuations. Such a critical exponent indicates a fractal behavior of the superconducting path. Our results thus indicate a strict two dimensional fluctuation percolation set (below the superconductivity onset temperature 195 K down to T(c)), and provide some proof for Tarascon et al. "shell conductivity path" hypothesis. We estimate the shell thickness to be of the order of 10 angstrom.

引用

页码：355 / 359

页数：5

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