Time-Dependent Ginzburg-Landau Simulation of Critical Current Density Including z-axis Anisotropy
Time-Dependent Ginzburg-Landau Simulation of Critical Current Density Including z-axis Anisotropy
复制标题
临界电流密度的瞬态 Ginzburg-Landau 仿真（包括 z 轴各向异性）
DOI：
10.1088/1742-6596/1857/1/012020
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Tetsuya Matsuno
中科院分区：
文献类型：
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作者：
Rina Yonezuka;Yusei Hamada;Kazunori Kamiji;Edmund Soji Otabe;Yasunori Mawatari;Tetsuya Matsuno
在这项研究中，对三维时间相关的金兹堡-朗道方程进行了数值求解，以可视化横向磁场下超导体中磁通线的运动。将销插入超导长方体，计算归一化临界电流密度 J c 的磁场依赖性。沿磁场方向（z轴）引入不同大小的各向异性yZ。还考虑了不同的引脚形状和方向：与磁场或电流方向平行排列的柱状引脚、球形引脚和场电流平面中的平面引脚。对于平行于场（沿着磁通线）排列的柱状销，J c 几乎不依赖于 yZ。此外，在归一化磁场下观察到该销几何形状的 J c-B 曲线中的峰值，对于所有考虑的 yz，B= 0.4。相反，对于与电流平行（垂直于磁通线）排列的柱状销和球形销，J c 取决于 yZ。在低磁场 (B= 0.1) 下，在这两种情况下，J c 都随着 yZ 的增加而增加。在平面销的情况下，J c 与 yZ 无关。总之，当平行于归一化磁场B插入销钉时，即使z轴各向异性yZ很大，J c 也不会减小。
In this study, the three-dimensional time-dependent Ginzburg-Landau equations were numerically solved to visualize the motion of the flux lines in a superconductor under a transverse magnetic field. Pins were inserted into a superconducting rectangular parallelepiped, and the magnetic field dependence of the normalized critical current density J c was calculated. Anisotropy yZof different magnitudes was introduced along the direction of the magnetic field (z-axis). Different pin shapes and orientations were also considered: columnar pins aligned parallel to the direction of either the magnetic field or the current flow, spherical pins, and a planar pin in the field-current plane. For the columnar pins aligned parallel to the field (along the flux lines), J c showed almost no dependence on yZ. Additionally, a peak in the J c-B c urve for this pin geometry was observed at normalized magnetic field, B= 0.4 for all considered yz. In contrast, J c was dependent on yZfor the columnar pins aligned parallel to the current flow (perpendicular to the flux lines) and the spherical pins. At low magnetic fields (B= 0.1), J c increased with increasing yZin both these cases. In the case of the planar pin, J c showed no dependence on yZ. In conclusion, when a pin was inserted parallel to the normalized magnetic field B, J c did not decrease even when the z-axis anisotropy yZwas large.