Characteristic microstructure in small Bi-2212 grains showing the Wohlleben effect as revealed by High-Resolution Electron Microscopy

被引：10

作者：

Freitag, B

Büchner, B

Knauf, N

Roden, B

Micklitz, H

Freimuth, A

Kataev, V

机构：

[1] Univ Bonn, Inst Anorgan Chem, D-53113 Bonn, Germany

[2] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[3] Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany

[4] Russian Acad Sci, Kazan Inst Tech Phys, Kazan 420029, Russia

来源：

EUROPHYSICS LETTERS | 1999年 / 45卷 / 03期

关键词：

D O I：

10.1209/epl/i1999-00177-6

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By means of high-resolution transmission electron microscopy and electron diffraction we show that samples of Bi-2212 high-temperature superconductors which exhibit the Wohlleben effect have an extremely polydomain microstructure on a mu m length scale. In directions perpendicular to the c-axis small crystallites are separated by well-defined atomically sharp (less than or similar to 1 nm) interfaces which provide good contacts between the domains in the ab-planes. The observed microstructure strongly favors the explanation of the Wohlleben effect due to spontaneous currents flowing in the closed paths between differently oriented unconventional (d-wave) superconductors.

引用

页码：393 / 398

页数：6

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