Abstract
Undoped and Ca- or Ag-doped YBa 2Cu 3O x (Y123) thin films were prepared by pulsed laser deposition on symmetric low angle SrTiO 3 bicrystals (4, 8, 12, 16 degree misorientation angle). The electrical transport properties of the inter- and intragrain critical current densities and V-I curves were investigated at 77K in magnetic fields up to 6T. Ca-doped Y123 bicrystal films (10 % Ca substitution) showed no significant j c-enhancement at 77K in zero field but a strongly decreased j c at higher magnetic fields due to a reduced irreversibility field at 77K. Ag-doped Y123 bicrystal films showed increased critical current densities at higher fields and a slightly shifted transition from strong to weak link behavior compared to undoped Y123 bicrystal films.
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