Grain Boundary Transport Properties in YBa2Cu3Ox Coated Conductors.

Bershuis, P. ; Miller, D. J. ; Kim, D. H. ; Gray, K. E. ; Feenstra, R. ; Christen, D. K.

Technical Information Center Oak Ridge Tennessee

关键词: Conductors;    High temperature superconductors;    Magnetic fields;    Critical current;    Hysteresis;   

RP-ID  :  DE2001768600

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Critical current data obtained as a function of magnetic field on an isolated grain boundary (GB) of a coated conductor and two other types of bicrystal GBs of YBa2Cu30, show a peak in the critical current and an unusual hysteresis. These results provide support for a new mechanism for enhanced GB critical currents, arising from interactions of GB vortices with pinned Abrikosov vortices in the banks of a GB, as suggested by Gurevich and Cooley. A substantial fraction of the enhancement, which can exceed a factor of ten, also occurs upon surpassing the critical current of the grains after zero field cooling. A bulk GB and thin film GBs show qualitatively identical results.