论文标题
ba $ _ {0.6} $ k $ _ {0.4} $ fe $ _ {2} $ as $ _ {2}
Effects of asymmetric splayed columnar defects on the anomalous peak effect in Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$
论文作者
论文摘要
为了增强超导体的临界电流密度（$ j_c $），通过快速粒子辐射引入柱状缺陷（CD）是有效的。通过分散CD的方向（张开CD），不仅已经确认了$ j_c $的进一步增强，而且在某个由辐射剂量确定的磁场上，在$ j_c $中的异常峰值效应（APE）都在$ j_c $中得到了证实。已经提出，猿来自扭结运动的抑制和/或涡旋纠缠在带有骨折的CD的系统中的影响。在这项研究中，我们测量$ j_c $最佳的K-doped Ba-122型基于铁的超导体Ba $ _ {0.6} $ k $ _ {0.4} $ _ {0.4} $ _ {2} $ as $ _ {2} $ as $ _ {2} $ a {2} $ a {2}。离子。我们讨论了张开CD对猿的平均方向的重要性。我们还讨论了猿类与涡旋的纠缠之间的关系。
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.
