Wohlleben effect in small grains of Bi-based high-temperature superconductors: Evidence for intrinsic nature of spontaneous currents

被引：13

作者：

Knauf, N

Fischer, J

Roden, B

Borowski, R

Freitag, B

Buchner, B

Micklitz, H

Freimuth, A

Kataev, V

Khomskii, DI

机构：

[1] UNIV KARLSRUHE,INST PHYS,D-76128 KARLSRUHE,GERMANY

[2] RUSSIAN ACAD SCI,KAZAN INST TECH PHYS,KAZAN 420029,RUSSIA

[3] UNIV GRONINGEN,DEPT PHYS,MAT RES CTR,NL-9747 AG GRONINGEN,NETHERLANDS

来源：

EUROPHYSICS LETTERS | 1996年 / 35卷 / 07期

关键词：

D O I：

10.1209/epl/i1996-00148-y

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the observation of the Wohlleben effect (WE) in powders of Bi-based high-temperature superconductors consisting of isolated grains with sizes of order 1 mu m In these small grains the Josephson contacts with negative critical current (pi-junctions) generally involved to explain the WE must be able to carry a current density of order j approximate to 10(5)-10(6) A/cm(2) even close to T-c. Such high spontaneous currents can be explained, if such contacts are not ordinary tunneling Josephson junctions but superconductor-normal-metal-superconductor junctions and if the superconducting order parameter has d-wave symmetry.

引用

页码：541 / 546

页数：6

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