| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Fabrication of IBAD-MgO and PLD-CeO2 Layers for YBCO Coated Conductors |
| MU Qing-Qing, LIU Lin-Fei, LI Yi-Jie** |
Key Laboratory of Artificial Structure and Quantum Control, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240
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| Cite this article: |
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MU Qing-Qing, LIU Lin-Fei, LI Yi-Jie 2015 Chin. Phys. Lett. 32 078102 |
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Abstract MgO thin films with different textures are fabricated by the ion beam assisted (IBAD) method on the Y2O3/Al2O3 buffered C276 tape. Then a CeO2 layer is directly grown on the IBAD-MgO film by the pulsed laser deposition (PLD) method. Effects of IBAD-MgO texture, substrate temperature and thickness on the grain alignment of the CeO2 layer are investigated. Film characterization is performed by x-ray diffraction and atomic force microscopy. It is found that the orientation and texture degree of the CeO2 layer are very sensitive to the IBAD-MgO texture. By optimizing the IBAD-MgO texture, CeO2 has pure (002) orientation and excellent biaxial texture deposited in a broad substrate temperature range. In addition, the PLD-CeO2 layer has a thickness effect. Under the optimized experimental condition, the PLD-CeO2 layer has a high in-plane texture of Δφ=2.9° and a smooth surface with an rms surface roughness of less than 2 nm. The critical current density Jc of a 0.4-μm-thick YBCO film deposited on the CeO2 layer is 6.25×106 A/cm2 at 77 K and a self-field.
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Received: 27 January 2015
Published: 30 July 2015
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| PACS: |
81.15.-z
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(Methods of deposition of films and coatings; film growth and epitaxy)
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84.71.Mn
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(Superconducting wires, fibers, and tapes)
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