Title :
Grain boundary transport properties in YBa2Cu3Ox coated conductors
Author :
Berghuis, P. ; Miller, D.J. ; Kim, D.H. ; Gray, K.E. ; Feenstra, R. ; Christen, D.K.
Author_Institution :
Div. of Mater. Sci., Argonne Nat. Lab., IL, USA
fDate :
3/1/2001 12:00:00 AM
Abstract :
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 YBa2Cu3Ox 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 (1994). A substantial fraction of this 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
Keywords :
barium compounds; critical currents; flux-line lattice; grain boundaries; high-temperature superconductors; magnetic hysteresis; yttrium compounds; YBa2Cu3O; YBa2Cu3Ox coated conductors; bicrystal; critical current; grain boundary transport properties; grain boundary vortices interactions; hysteresis; pinned Abrikosov vortices; zero field cooling; Conductors; Cooling; Critical current; Grain boundaries; High temperature superconductors; Laboratories; Magnetic fields; Magnetic hysteresis; Materials science and technology; Superconducting thin films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
