| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Enhancement of Critical Current Density and Flux Pinning in Acetone and La2O3 Codoped MgB2 Tapes |
| GAO Zhao-Shun1, MA Yan-Wei1**, WANG Dong-Liang1, ZHANG Xian-Ping1, AWAJI Satoshi2, WATANABE Kazuo2
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1Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, P.O. Box 2703, Beijing 100190
2High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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| Cite this article: |
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GAO Zhao-Shun, MA Yan-Wei, WANG Dong-Liang et al 2010 Chin. Phys. Lett. 27 117401 |
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Abstract MgB2 tape samples with simultaneous additions of acetone and La2O3 were prepared by an in−situ processed powder-in-tube method. Compared to the pure and single doped tapes, both transport Jc and fluxing pinning are greatly improved by acetone and La2O3 codoping. Acetone supplies carbon into the MgB2 crystal lattice and increases the upper critical field, while the La2O3 reacts with B to form LaB6 nanoparticles as effective flux pining centers. The improvement of the superconducting properties in codoped tapes can be attributed to the combined effects of improvement in Hc2 and flux pinning.
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| Keywords:
74.70.Ad
74.25.Sv
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Received: 10 July 2010
Published: 22 October 2010
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| PACS: |
74.70.Ad
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(Metals; alloys and binary compounds)
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74.25.Sv
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(Critical currents)
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