银包覆BSCCO带的E(I)特性随外加磁场的各向异性

P Ušák, L Janšák, F Chovanec
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引用次数: 1

摘要

由于银鞘层BSCCO-2223带导体的宏观形态,以及银鞘层内晶粒堆积的内部结构和它们的相互取向,它们的伏安特性在外部磁场取向上不是各向同性的。对于相同的绝对场值,E(I)曲线的行为是矢量B对带轴和表面的倾斜度的敏感指标。由于邻近效应和弱环节结构,外加磁场的增大会降低样品的整体积分电流容量。这种效应在垂直方向的B上是明显的,但在平面方向上观察到一个类似的图像,E(I)曲线相应的位移到更高的电流水平。对于选定的和逐渐增加的外磁场水平,在E(I)上的矢量B,平行和垂直的倾斜相对于磁带平面的差异,特征被呈现。通过这种方法,研究了不同场强水平上的各向异性表现。场矢量保持垂直于磁带轴。通过热致开裂过程揭示了热循环对E(I)的影响。
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Anisotropy of E(I) characteristics of Ag-sheathed BSCCO tapes with respect to external magnetic field

Because of the macroscopic form of Ag-sheathed BSCCO-2223 tape conductors, as well as internal structure of grain build up and their mutual orientation within the Ag sheath, their volt–ampere characteristics are not isotropic with respect to external magnetic field orientation. For the same absolute field values the behaviour of E(I) curves are a sensitive gauge of vector B inclination to tape axis and to the surface plane. As a result of the proximity effect and the weak links structure, the increasing external magnetic field reduces overall integral current capacity of the sample. The effect is pronounced at a perpendicular orientation of B but an analogic picture is observed for planar orientation with a corresponding shift of E(I) curves to higher current levels. For selected and gradually increasing levels of external magnetic field the difference in the vector B, parallel and perpendicular inclination with respect to tape plane on E(I), characteristics are presented. In this way the anisotropy manifestation at the different field levels is studied. The field vector remains perpendicular to tape axis. Also revealed is the influence of thermal cycling on E(I) through the thermomechanically induced cracking process.

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