Orientation Behavior and Mechanism of Ag-doped GdBa2Cu3O7-δ Superconducting thin Films Derived by Metal Organic Deposition
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Ag-doped GdBa2Cu3O7−δ (GdBCO)-coated conductors are fabricated via a metal-organic process. The X-ray diffraction and scanning electron microscopy results show that the growth conditions of the GdBa2Cu3O7−δ matrix are modified, resulting in less a-axis growth and much smoother surface morphology and finally giving rise to much improvement of superconducting performance in a wide range of processing parameters. The orientation behavior and mechanism of Ag-doped GdBCO films are investigated. To reasonably explain the orientation behavior of Ag-doped GdBCO films, a simple nucleation model for Ag-doped GdBCO is established, suggesting quasi-liquid phases are perfected by Ag. As a consequence, a-axis nucleation is suppressed and strong c-axis nucleation is achieved in a wider processing window.
KeywordsAg addition Superconducting thin film MOD GdBCO Orientation mechanism
This work is partly sponsored by the National Key R&D Program (2016YFF0101701), the National Natural Science Foundation of China (51572165, 11174193 and U1530115), the Science and Technology Commission of Shanghai Municipality (16521108400, 16DZ0504300, and 14521102800), the Science and Technology Key Foundation of Anhui Province(1604a0702037).
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