Magnetic pinning-effect in Nd0.7Ca0.3MnO3/YBa2Cu3O7bilayer

✍ Scribed by Hsu, Daniel ;Lin, J. G. ;Wu, W. F.

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 299 KB
• Volume: 204
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200777414

✦ Synopsis

Abstract

The vortex lines of superconductor can be driven by electrical currents, which are often coupled with a reliable control of flux quanta movement by defects or magnetic domains. In this work, the magnetic pinning‐effect in Nd~0.7~Ca~0.3~MnO~3~/YBa~2~Cu~3~O~7~ (NCMO/YBCO) bilayers is investigated. It is found that by increasing the field from 0 to 5 Tesla, the critical current I~c~ of pure YBCO film at 50 K is suppressed by three orders of magnitude. However, in the NCMO/YBCO bilayer I~c~ is less sensitive to the field and maintains at the level of 100 mA at high field. This result indicates that the magnetic pining effect of NCMO is much more efficient than the conventional routes, which maybe related to the fine domain structure of NCMO film. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)