Abstract
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 (Tc) and critical current density (Jc) are 91.2 K and 2.5 MA/cm 2 (at 77 K, self field) respectively. With increasing thickness, Tc drops as well as Jc. Unfortunately, the critical current (Ic) 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.
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