Thick DyBCO/YBCO Multilayer Films on LaMnO3 Substrate Derived by Metal Organic Deposition Method

DyBa2Cu3O7−δ /YBa2Cu3O7−δ multilayer thick films were prepared on oxide-buffered Hastelloy substrates by low fluorine metal organic deposition (MOD) process with a thickness ranging from 0.7 μm to 2.8 μm. In the thickness of 1.4 μm sample, transition temperature (T c) and critical current density (J c) are 91.2 K and 2.5 MA/cm 2 (at 77 K, self field) respectively. With increasing thickness, T c drops as well as J c. Unfortunately, the critical current (I c) does not reach an ideal value when the thickness is 2.8 μm just only 365A/cm width as thickness is 2.1 μm. Rough surface structure, compressive, and tensile stress in the interlamination and Ba-Cu-O mixed phase were found in layer thickness of 2.1 μm and 2.8 μm are assumed to be the main reason for the limitation of the current transport.