Nanorod-Superconductor Composites: A Pathway to Materials with High Critical Current Densities
Nanorod-Superconductor Composites: A Pathway to Materials with High Critical Current Densities
复制标题
DOI：
10.1126/science.273.5283.1836
复制
发表时间：
1996-09
期刊：
影响因子：
56.9
通讯作者：
Peidong Yang;Charles M. Lieber
中科院分区：
文献类型：
--
作者：
Peidong Yang;Charles M. Lieber
高温氧化铜超导体（HTSC）的大多数大规模应用需要在接近液氮沸点的温度下的高临界电流密度（Jc’s）才能在技术上有用，尽管热激活的通量流在这些温度下显著降低Jc。这种固有的限制可以通过在HTSC中引入纳米尺寸的柱状缺陷来克服。氧化镁的纳米棒生长并掺入到HTSC中以形成纳米棒-HTSC复合材料。以这种方式，可以产生具有垂直于和平行于氧化铜平面的取向的高密度纳米棒柱状缺陷。与参考样品相比，纳米棒-HTSC复合材料的Jc在高温和磁场下显著增强;因此，这些复合材料可能代表了在大规模应用中克服热激活磁通量流动的技术上可行的策略。
Most large-scale applications of the high-temperature copper oxide superconductors (HTSCs) require high critical current densities (Jc's) at temperatures near the boiling point of liquid nitrogen to be technologically useful, although thermally activated flux flow reduces Jc dramatically at these temperatures. This intrinsic limitation can be overcome by introducing nanometer-sized columnar defects into an HTSC. Nanorods of magnesium oxide were grown and incorporated into HTSCs to form nanorod-HTSC composites. In this way, a high density of nanorod columnar defects can be created with orientations perpendicular and parallel to the copper oxide planes. The Jc's of the nanorod-HTSC composites are enhanced dramatically at high temperatures and magnetic fields as compared with reference samples; these composites may thus represent a technologically viable strategy for overcoming thermally activated flux flow in large-scale applications.