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首页> 外文期刊>Physica, C. Superconductivity and its applications >The effect of SiC nanoparticle addition on the flux pinning properties of MgB_2
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The effect of SiC nanoparticle addition on the flux pinning properties of MgB_2

机译：SiC纳米颗粒的添加对MgB_2的磁通钉扎性能的影响

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摘要

The nanoparticle-MgB_2 composite superconducting sample, (SiC)_(4wt.%)(MgB_2)_(96wt.%) ((SiC)_4-MgB_2), was prepared, and the effect of nanoparticle additions on the magnetic flux pinning was investigated. The measurement and comparison of isothermal magnetization M(H), for pure-MgB_2 powder and sintered pellets of (SiC)_4-MgB_2 and pure-MgB_2 were carried out at temperatures between 5 and 50 K in fields up to 8.5 T. The magnetic irreversibility ΔM(H) curves of the (SiC)_4-MgB_2 follow almost identical lines of both pure-MgB_2 powder and sintered bulk MgB_2 in the region above a specific magnetic field (called a merged field), which gradually decreases as the temperature increases. The (SiC)_4-MgB_2 composite superconductor has exhibited the flux pinning effect which comes from both the grain boundaries and the point defect weak pinning centers in the region below the merged field line. This is different from the case of pure-MgB_2 powder and sintered bulk MgB_2 which showed mostly the grain boundaries pinning.
机译：制备了纳米颗粒-MgB_2复合超导样品（SiC）_（4wt。％）（MgB_2）_（96wt。％）（（SiC）_4-MgB_2），纳米颗粒的添加对磁通钉扎的影响为调查。对纯MgB_2粉末和（SiC）_4-MgB_2和纯MgB_2烧结小球的等温磁化强度M（H）的测量和比较是在5至50 K的温度下于8.5 T的磁场中进行的。 （SiC）_4-MgB_2的不可逆性ΔM（H）曲线在特定磁场（称为合并磁场）上方的区域中遵循纯MgB_2粉末和烧结块MgB_2几乎相同的线，随温度升高而逐渐减小。 （SiC）_4-MgB_2复合超导体表现出通量钉扎效应，该效应来自晶界和合并场线以下区域中的点缺陷弱钉扎中心。这与纯MgB_2粉末和烧结的块状MgB_2的情况不同，后者大部分显示出晶界钉扎。

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