Volume 45, Number 3, February 1999
|Page(s)||393 - 398|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Characteristic microstructure in small Bi-2212 grains showing the Wohlleben effect as revealed by High-Resolution Electron Microscopy
Institut für Anorganische
Chemie, Universität Bonn
Römer Str. 164, D-53113 Bonn, Germany
2 II. Physikalisches Institut, Universität zu Köln Zülpicher Str. 77, 50937 Köln, Germany
3 Physikalisches Institut, Universität Karlsruhe - 76128 Karlsruhe, Germany
4 Kazan Institute for Technical Physics, Russian Academy of Sciences 420029 Kazan, Russia
Accepted: 22 November 1995
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 length scale. In directions perpendicular to the c-axis small crystallites are separated by well-defined atomically sharp ( 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.
PACS: 74.72.Hs – Bi-based cuprates / 61.16.Bg – Transmission, reflection and scanning electron microscopy (including EBIC) / 74.25.Ha – Magnetic properties
© EDP Sciences, 1999
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