Improvement of Surface Morphology and Critical Current Density of YDy 0 . 2 Ba2Cu 3 . 3 O7−δ Thick Films by Inserted RE2O3 Thin Films
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Various artificial multilayers consisting of YDy0.2 Ba2Cu3O7−ε /RE2O3/YDy0.2Ba2Cu3O7−ε films (RE = Y, Gd, Eu, etc.) about 1 μm in a sandwich-type structure are fabricated on oxide-buffered Hastelloy substrates using low-fluorine metalorganic deposition (MOD) method. Superconducting and microscopic performances are studied on composite YDyBaCuO multilayer films with and without intercalated Y2O3, Gd2O3, and Eu2O3 ultrathin films. X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) are used to investigate growth orientation and surface morphology, revealing that multiple superconducting YDyBaCuO thin films separated by an ultrathin RE2O3 interlayer have better c-axis orientation, better in-plane and out-plane textures, as well as superior surface morphology. Using this interlayer technology, a significant enhancement of critical current density (J c) both in self-field and under applied magnetic field is obtained.
KeywordsYDyBaCuO RE2O3 interlayer Thick film Low-fluorine metal organic deposition
This work was supported in part by the Shanghai Key Laboratory of High Temperature Superconductors (14DZ2260700), the Science and Technology Commission of Shanghai Municipality (16521108400, 16DZ0504300, and 14521102800), and the National Natural Science Foundation of China (51572165, 11174193, and 51202141).
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