Angular magnetic-field dependence of vortex matching in pinning lattices fabricated by focused or masked helium ion beam irradiation of superconducting YBa2Cu3O7-δ thin films
Angular magnetic-field dependence of vortex matching in pinning lattices fabricated by focused or masked helium ion beam irradiation of superconducting YBa2Cu3O7-δ thin films
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DOI：
10.1063/10.0000863
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发表时间：
2020-04-01
影响因子：
0.8
通讯作者：
Lang, W.
中科院分区：
文献类型：
--
作者：
Aichner, B.;Mletschnig, K. L.;Lang, W.
本文研究了在人工钉扎条件下，铜氧化物高临界温度超导体YBa_2Cu_3O_（7-δ）（YBCO）薄膜的磁场可磁化性效应与角度的关系。通过两种不同的离子辐照方法-在氦离子显微镜中扫描聚焦的30 keV离子束或通过模板掩模采用宽场75 keV He+离子束制造点缺陷列。离子-靶相互作用和由此产生的碰撞级联的模拟表明，与这两种方法的缺陷列的子μ m间距的正方形阵列可以创建。它们由密集的点缺陷集群，作为钉扎中心的Abrikosov涡。这是验证的临界电流和相关的磁通流阻与磁场在匹配场的最小值的可重复的峰值的测量。在倾斜磁场中，匹配特征仅由平行于柱状缺陷的轴的磁场分量控制，这证实磁通量沿着缺陷柱穿透。我们表明，后者占主导地位的钉扎景观，尽管在薄YBCO薄膜的强大的内在钉扎。
The angular dependence of magnetic-field commensurability effects in thin films of the cuprate high-critical-temperature superconductor YBa2Cu3O7-delta (YBCO) with an artificial pinning landscape is investigated. Columns of point defects are fabricated by two different methods of ion irradiation - scanning the focused 30 keV ion beam in a helium ion microscope or employing the wide-field 75 keV He+ beam of an ion implanter through a stencil mask. Simulations of the ion-target interactions and the resulting collision cascades reveal that with both methods square arrays of defect columns with sub-mu m spacings can be created. They consist of dense point-defect clusters, which act as pinning centers for Abrikosov vortices. This is verified by the measurement of commensurable peaks of the critical current and related minima of the flux-flow resistance vs magnetic field at the matching fields. In oblique magnetic fields, the matching features are exclusively governed by the component of the magnetic field parallel to the axes of the columnar defects, which confirms that the magnetic flux is penetrated along the defect columns. We demonstrate that the latter dominate the pinning landscape despite of the strong intrinsic pinning in thin YBCO films.