Superconductor with enhanced current carrying capability and method for making such a superconductor

A superconductor, in particular a bicrystalline or polycrystalline superconductor of the family of the Perovskite superconductors, with tailored electrical properties such as critical current density and/or interface resistance,

• characterized by
• having a predetermined dopant profile c(x,y,t) of said grain boundaries of essentially
• 2 c ⁡ ( x , y , t ) = c o ⁢ exp ⁡ [ - y ⁢ 2 π ⁢ ⁢ D V ⁢ t 4 ⁢ δ ⁢ ⁢ D KG / D V ] ⁢ { 1 - erf ⁡ ( x 2 ⁢ D V ⁢ t ) }
• wherein DKG is the diffusion coefficient along the grain boundary, Dv is the bulk or intragrain diffusion coefficient, δ is the width of the grain boundary, t is the processing time, co is a constant, erf(z) is an error function, the x axis of the coordinate system being essentially perpendicular and the y axis parallel to the grain boundary.

A method for making a superconductor multilayer structure, in particular a bicrystalline or polycrystalline multilayer structure of Perovskite superconductors, comprising

• growing said layers of said multilayer structure using
• oxygen of a pressure of 0.01 to 0.5 mbar, preferably 0.25 mbar,
• stabilized heater temperatures of 500 to 800° C., preferably 760° C.,
• laser pulses of an experimentally selected energy density, preferably 2.2 J/cm2 at 248 nm, and
• an annealing step including a cool down procedure of several minutes at a lower temperature and at a different oxygen pressure, preferably 12 to 20 minutes at 400 to 500° C. and 0.4 to 1.0 bar.