HRTEM Surface Profile Imaging of Superconducting YBa2Cu4O8

✍ Scribed by Wuzong Zhou; Yan Xin; David A. Jefferson

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 544 KB
• Volume: 149
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8535

✦ Synopsis

Surface pro5le images have been recorded from high-Tc superconducting YBa 2 Cu 4 O 8 using high-resolution transmission electron microscopy. The surface regions are found to be relatively more stable than those of YBa 2 Cu 3 O 7 . The stability of the double CuO chains in the vicinity of a crystal surface was found to depend on whether or not they were parallel or perpendicular to the surface in question. Possible mechanisms of the formation of both surface structures and near-surface defects are discussed.