High T_c Superconducting Ba₂YCu₃O_x Films Prepared by Py rolysis of Organic or Inorganic Acid Salts

Abstract

Ba₂YCu₃O_x films were prepared from inorganic and organic acid salts to investigate the influences of starting materials on the superconducting transition. All films derived from acetates, nitrates and long-chain organic acid salts, as well as those from 2-ethylhexanoates reported previously, showed high T_c superconducting transition after heated at 800°C in pure oxygen atmosphere. The dependence of T_c values on the oxygen content required of the starting materials in pyrolysis shows that annealing depends on the starting materials. This is probably related to the concentration of the oxygen defects and/or the crystallization process of high-T_c phase.