Abstract
Domain patterns of magnetic flux penetrated in YBa 2Cu 3O 7−δ superconductors have been observed by means of a high-resolution Faraday technique. The experimental conditions for observing domain patterns with the high-resolution Faraday effect are discussed. Flux-density profiles and the related flux-density gradients were determined from an analysis of the domain patterns. An analysis of the measured flux-density gradients in single-crystals shows that twin-boundaries are not the strongest acting pinning mechanism at low temperatures. Our results support the assumption that intrinsic pinning determines the flux-density gradients and governs the critical currents. It is shown that the flux-density gradients in grains of the sintered specimens are larger than in single-crystals. The resulting thirty times greater pinning forces are measured both magneto-optically and with a SQUID-magnetometer. This behaviour may be explained by superimposed extrinsic pinning effects such as grain-boundaries.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
