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MgB2 thick films with remarkable ductility on stainless steel substrate |
| ZHUANG Cheng-gang1, CHEN Li-ping1, DING Li-li1, ZHANG Kai-cheng1, CHEN Chin-ping1, FENG Qing-rong1, GAN Zi-zhao1, AN Ling2, XU Jun3 |
| 1.School of Physics and State Key Laboratory for Artificial Structure and Mesoscopic Physics, Peking University, Beijing 100871, China; 2.Department of Physics, ChangJi College, Xinjiang 831100, China; 3.School of Physics and State Key Laboratory for Artificial Structure and Mesoscopic Physics, Peking University, Beijing 100871, China; Electron Microscopy Laboratory, Peking University, Beijing 100871, China; |
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Abstract We fabricated several superconducting MgB2 thick films on stainless steel (SS) substrates by using hybrid physical-chemical vapor deposition (HPCVD) technique. The thickness was in the 10 m μ to 20 m μ range, and the onset critical transition temperature Tc (onset) and the width of the superconducting transition (?T) were about 37.8 and 1.2 K. They were dense and textured along (101) direction with high tenacity, despite the existence of a little amount of MgO and Mg. We bent the films at different degrees and studied the ductility and transport properties of these MgB2 thick films under applied force. The results demonstrated that the superconducting properties of these thick films, prepared by HPCVD, stay almost unaffected even with the films bent to a large degree with a curvature of 0.5 mm. This indicated that the superconducting wires or tapes of MgB2 with a core of SS had the advantages of avoiding rigidity and brittleness in industrial handling. The technique of HPCVD has, therefore, a high application potential.
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Issue Date: 05 June 2006
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