脉冲磁场处理对碳纳米管掺杂MgB_2线材临界电流密度的影响

Effect of pulsed magnetic field on critical current in carbon-nanotube-doped MgB_2 wires

对碳纳米管(CNT)掺杂MgB2超导体磁场处理后的行为进行了研究.结果表明,CNT掺杂MgB2超导体经5T脉冲磁场处理后临界电流密度Jc(H)在低磁场下提高了2—3倍,高场下提高一个数量级以上,扫描电镜结果显示CNT沿着处理磁场方向规则排列并且成为MgB2基体的形核中心和高效的磁通钉扎中心.

This study is about carbon-nanotube （CNT）-doping of MgB2 superconductor processed under the magnetic field. The Jc（H） for CNT doped sample increased by a factor of 2--3 in low filed and more than an order of magnitude in high field after processing in magnetic field. The alignment of CNT along the processing field direction was observed by SEM.