不对称张开柱状缺陷对Ba $_{0.6}$ K $_{0.4}$ Fe $_{2}$ As $_{2}$反常峰效应的影响
Effects of asymmetric splayed columnar defects on the anomalous peak effect in Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$
摘要：
为了提高超导体的临界电流密度（$J_c$），通过快速粒子辐照引入柱状缺陷（CD）是有效的。通过分散CD的方向（张开CD），不仅证实了$J_c$的进一步增强，而且观察到在由辐照剂量确定的一定磁场下$J_c$中的反常峰效应（APE）。有人提出，APE产生的扭结运动的抑制和/或涡旋纠缠的影响，在系统与张开的CD。在这项研究中，我们测量的最佳K掺杂的Ba-122型铁基超导体Ba $_{0.6}$ K $_{0.4}$ Fe $_{2}$ As $_{2}$单晶的$J_c$性能，通过照射2.6 GeV的U离子，引入不对称的CD相对于$c$轴。我们讨论了张开CD的平均方向对APE的意义。我们还讨论了APE与涡旋纠缠的关系。
英文摘要：
In order to enhance the critical current density ($J_c$) of superconductors, introduction of columnar defects (CDs) through swift-particle irradiation is effective. By dispersing the direction of CDs (splayed CDs), not only further enhancement of $J_c$ has been confirmed but also an anomalous peak effect (APE) in $J_c$ at a certain magnetic field determined by the irradiation dose was observed. It has been proposed that the APE arises from the suppression of kink motion and/or the effects of vortex entanglement in systems with splayed CDs. In this study, we measure $J_c$ properties of optimally K-doped Ba-122-type iron-based superconductor Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$ single crystals with splayed CDs that are introduced asymmetrically with respect to the $c$-axis by irradiating 2.6 GeV U ions. We discuss the significance of the average direction of splayed CDs to the APE. We also discuss the relationship between the APE and the entanglement of vortices.
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