Direct observation of discommensurate walls in Bi-Ca-Sr-Cu-O superconductors

• DOI: 10.1103/physrevb.41.4093
• Publication Date: 2002-07-26T22:48:50Z
• Authors: J.-W. Lee; D. E. Laughlin; S. Nam
• Keywords: 0103 physical sciences; 01 natural sciences

The dislocations and twins in superconducting Bi-Ca-Sr-Cu-O samples are examined by scanning electron microscopy transmission microscopy. results indicate that these defects inherent to the materials. grains large size (1--10 \ensuremath{\mu}m), but they frequently divided into subgrains low-angle grain boundaries. Furthermore, evidence is found for discommensurate walls associated with incommensuration along b axis.