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

B. Freitag; B. Büchner; N. Knauf; B. Roden; H. Micklitz; A. Freimuth; V. Kataev

doi:10.1209/epl/i1999-00177-6

All issues

Volume 45 / No 3 (February 1999)

Europhys. Lett., 45 3 (1999) 393-398

Abstract

Issue		Europhys. Lett. Volume 45, Number 3, February 1999


Page(s)		393 - 398
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1999-00177-6
Published online		01 September 2002

Europhys. Lett., 45 (3), pp. 393-398 (1999)

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

B. Freitag¹, B. Büchner², N. Knauf², B. Roden², H. Micklitz², A. Freimuth³ and V. Kataev⁴

¹ 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

Received: 11 August 1995
Accepted: 22 November 1995

Abstract

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 $\mu {\rm m}$ length scale. In directions perpendicular to the c-axis small crystallites are separated by well-defined atomically sharp ( $\lesssim1$ 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

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