论文标题
通过聚焦或掩盖的氦离子光束辐照YBA yba $ _2 $ _2 $ _3 $ _3 $ o $ _ {7-Δ} $薄膜
Angular magnetic-field dependence of vortex matching in pinning lattices fabricated by focused or masked helium ion beam irradiation of superconducting YBa$_2$Cu$_3$O$_{7-δ}$ thin films
论文作者
论文摘要
磁场高薄膜中磁场可高度效应的角度依赖性在研究带有人工固定的landscape的薄膜中的高临界超导体超导体yba $ _ {2} $ cu $ _ {3} $ o $ $ _ {7-Δ} $（ybco）。点缺陷的列是通过两种不同的离子辐照方法制造的 - 在氦离子显微镜中扫描聚焦的30 keV离子光束，或者通过模板面膜采用离子植入器的宽场75 keV He $^+$ beam。离子 - 目标相互作用和结果碰撞级联反应的模拟表明，使用这两种方法，都可以创建带有子$ m间距的缺陷列的正方形阵列。它们由密集的点 - 缺陷簇组成，充当Abrikosov涡流的固定中心。通过测量匹配磁场上通量流电阻与磁场的临界电流和相关最小值的可相称峰的测量。在倾斜磁场中，匹配特征仅由平行于柱状缺陷轴平行的磁场的成分控制，这证实磁通量沿缺陷柱穿透。我们证明，尽管在薄YBCO膜中有强烈的内在固定固定，但后者占据了固定景观。
The angular dependence of magnetic-field commensurability effects in thin films of the cuprate high-critical-temperature superconductor YBa$_{2}$Cu$_{3}$O$_{7-δ}$ (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-$μ$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.
