Skip to main content

Thickness dependence mechanisms of the critical current density in high-Tc cuprate superconductor films

Buy Article:

$43.90 plus tax (Refund Policy)


The obtained electron backscattering diffraction data and high-resolution transmission electron microscopy have shown that the nanostructure of epitaxial HTS YBCO films evolves essentially with the film thickness. This happens due to a high deposition temperature and a high dislocation mobility that induce polygonization, dislocation rearrangement and a remarkable reduction of the out-of-plane dislocation density. The analysis of experimental thickness dependences of the critical current in the framework of existing pinning models leads to the conclusion that the c-axis-correlated pinning by out-of-plane edge dislocations plays a dominant role. Thus, the evolution of the dislocation nanostructure is responsible for the critical current density reduction. Embedding of nanoparticles into HTS films should be useful only if they are coherently coupled with the matrix and extra dislocations are being formed during the film growth. The nanoparticles just preserve a high density of dislocations. Another effect is self-assembling of nanoparticles within dislocation cores forming a 'bamboo structure'. This phenomenon may result in an enlargement of the dislocation normal core and an essential increase of the elementary pinning force.

Document Type: Research Article


Publication date: December 1, 2007


Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more