Effect of W-addition on pinning property of MgB2 |
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| Authors: | Y Takikawa M Takeda M Migita M Uehara T Kuramoto Y Kimishima |
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| Institution: | 1. Superconductivity Research Laboratory/ISTEC, Tokyo, Japan;2. Waseda University, Tokyo, Japan |
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| Abstract: | The 5d transition metal W was added into the MgB2 superconductor. The Mg, B and W were sintered at 1173 K for 30 min under H2/Ar atmosphere in the electric furnace. The Wx(MgB2)1?x samples were prepared in the W concentration range of 0 ? x ? 0.05. Temperature and field dependences of magnetization were measured by the SQUID magneto-meter. The field and x dependences of Jc at 20 K were analyzed by the extended critical state model. The enhancement of Jc became maximum for the x = 0.02 sample. |
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