Abstract
Nearly single-phase (2212), high T c , Bi 2Sr 2K 1Ca 1Cu 2O x films with c-axis orientation and T CO = 86K have been fabricated on MgO (100) substrates by laser deposition from melt-quenched amorphous targets. Doping the targets with a small amount of potassium (0.02 formula unit, replacing strontium) prevents cracking and fracture of the target during irradiation by the laser, and also improves the superconducting properties of the resulting films. Normalized critical current temperature dependence has been investigated for narrow tracks produced from these films by laser etching. SNS junctions are found to be predominant, and the characterization of the intergrain boundaries is not changed by potassium doping.
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