โ Scribed by G.P. Meisner; C.A. Taylor
No coin nor oath required. For personal study only.
Critical current measurements give quantitative information regarding the dissipationless electrical current carrying capability of bulk high-To materials. We report an improvement of the contactless transformer technique for measuring directly the bulk transport critical currents of superconductors, and report critical currents of bulk high-To YBa2Cu3Ofbased materials as a function of sample geometry, composition, and preparation conditions. We found that the critical current density of superconductors is not independent of sample geometry, and we propose a supereurrent/magnetic flux pinning field model of the critical current state of superconductors to explain our results.
๐ SIMILAR VOLUMES
Bulk samples of YBa2Cu307 ,. prepared by the solid state reaction method exhibited high density (96%) and high J,. (2586 Acm 2) values at 77 K and zero magnetic field. The effect of" extended heat treatments on the density and oxygen content of the samples is discussed in connection with microstruct