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首页> 外文期刊>Physica, C. Superconductivity and its applications >Evaluation of field-angle anisotropy of critical current in multifilamentary Bi-2223 tapes prepared by CT-OP process
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Evaluation of field-angle anisotropy of critical current in multifilamentary Bi-2223 tapes prepared by CT-OP process

机译：CT-OP法制备复丝Bi-2223胶带中临界电流的场角各向异性评估

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摘要

The critical current property of Bi-2223 silver sheathed tape has been significantly improved by application of ConTrolled Over Pressure (CT-OP) process with adjusting temperature and oxygen partial pressure at the final heat treatment. In this paper, the field-angle dependence of the critical current density was measured at 77.3 K and the crystalline misorientation angle was estimated for four specimens with different critical current densities. It is found that in a parallel magnetic field, the critical current density of the latest Bi-2223 tape of 190 A class is remarkably higher than the other specimens over a wide region of magnetic field. On the other hand, although the critical current density of the latest tape in a normal magnetic field is higher than the other specimens, the difference is relatively small especially at high magnetic fields. Thus, the field-angle anisotropy of the latest tape is higher than the other specimen. The observed results can be explained by the improved condensation energy density and the better c-axis alignment in the latest tape.
机译：通过应用ConTrolled Over Pressure（CT-OP）工艺并在最终热处理时调节温度和氧气分压，Bi-2223银护套胶带的临界电流性能已得到显着改善。在本文中，在77.3 K下测量了临界电流密度的场角依赖性，并估计了四个具有不同临界电流密度的样品的晶体取向差角。发现在平行磁场中，最新的190 A级Bi-2223胶带的临界电流密度在宽的磁场范围内明显高于其他样品。另一方面，尽管最新的磁带在正常磁场中的临界电流密度高于其他样品，但差异相对较小，尤其是在高磁场下。因此，最新磁带的视场角各向异性高于其他样本。观察到的结果可以用最新的磁带中改善的冷凝能量密度和更好的c轴对齐来解释。

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