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A home-designed MOCVD system has been employed to prepare Gd0.5Y0.5Ba2Cu3O7-δ (GdYBCO) thin films on LaMnO3/ epitaxial-MgO/ IBAD-MgO/ solution-deposition-planarization-Y2O3 buffered Hastelloy tapes,which were direct heated by the joule effect after applying an electrical current (Ih) through the Hastelloy tapes.The effect of the mole ratio of metal organic sources has been systematically investigated.