关于窄化涂覆导体膜：传输临界电流的颗粒感生场滞后的出现
On narrowing coated conductor film: emergence of granularity-induced field hysteresis of transport critical current
摘要：
已知多晶或粒状超导材料中的临界电流密度Jc由于场在相邻晶粒之间的边界内的聚焦而与所施加的场H滞后。这在所谓的涂覆导体中是令人关注的，其中超导膜生长在金属衬底的颗粒状但纹理化的表面上。虽然以前的工作主要是在Jc确定使用感应或磁化电流，本工作利用运输电流通过在条带几何形状中施加的电位。据观察，该效果是不明显的使用运输电流，可能是由于两种类型的测量之间的标准电压的差异很大。然而，当通过图案化将膜变窄为200微米、100微米或80微米时，由于迫使渗透穿过更高角度的晶界，因此可以清楚地看到滞后。这种效果进行了比较，为薄膜上生长的离子束辅助沉积（IBAD）YSZ基板和那些生长在滚动辅助双轴织构基板（RABiTS），其中晶粒是约10倍大。滞后是更明显的后者，这是更有可能有一个薄弱的晶界跨越的宽度的微桥。这对于涂层导体将被条纹化以减少交流损耗的应用也是值得关注的。
英文摘要：
Critical current density Jc in polycrystalline or granular superconducting material is known to be hysteretic with applied field H due to the focusing of field within the boundary between adjacent grains. This is of concern in the so-called coated conductors wherein superconducting film is grown on a granular, but textured surface of a metal substrate. While previous work has mainly been on Jc determined using induced or magnetization currents, the present work utilizes transport current via an applied potential in strip geometry. It is observed that the effect is not as pronounced using transport current, probably due to a large difference in criterion voltage between the two types of measurements. However, when the films are narrowed by patterning into 200-, 100-, or 80-micron, the hysteresis is clearly seen, because of the forcing of percolation across higher-angle grain boundaries. This effect is compared for films grown on ion-beam-assisted-deposited (IBAD) YSZ substrate and those grown on rolling-assisted-biaxially-textures substrates (RABiTS) which have grains that are about ten times larger. The hysteresis is more pronounced for the latter, which is more likely to have a weak grain boundary spanning the width of the microbridge. This is also of concern to applications in which coated conductors will be striated in order to reduce of AC losses.
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