Title :
Critical current of YBCO grain boundaries in large magnetic fields
Author :
Verebelyi, D.T. ; Prouteau, C. ; Feenstra, R. ; Christen, D.K.
Author_Institution :
Oak Ridge Nat. Lab., TN, USA
fDate :
6/1/1999 12:00:00 AM
Abstract :
Superconducting electrical transport across single grain boundaries (GBs) in YBCO shows interesting behavior in substantial magnetic fields. Measurements on [001] tilt bicrystal YBCO thin films in strong magnetic fields are consistent with the following: Low-angle GBs (<10/spl deg/) are composed of well-ordered bridges that act as strong superconducting inter-granular links; large-angle GBs exhibit weak coupling behavior that retains a well defined critical current even at high field.
Keywords :
barium compounds; bicrystals; critical currents; grain boundaries; high-temperature superconductors; magnetoresistance; tilt boundaries; yttrium compounds; YBCO grain boundaries; YBa/sub 2/Cu/sub 3/O/sub 7/; bridges; critical current; large magnetic fields; single grain boundaries; strong magnetic fields; strong superconducting inter-granular links; superconducting electrical transport; tilt bicrystal YBCO thin films; weak coupling; Bridges; Couplings; Critical current; Current measurement; Grain boundaries; Magnetic field measurement; Magnetic fields; Magnetic films; Superconducting thin films; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
