论文标题
鱼尾效应和高渗透合金超导体的涡流相图
Fishtail effect and the vortex phase diagram of high-entropy alloy superconductor
论文作者
论文摘要
高渗透合金（HEA）是在材料科学和凝结物理学中引起的引人入胜的主题。尽管在HEAS中发现了几种类型的超导体，但是到目前为止，HEA超导体的临界电流（JC）仍然没有表现。在这里，我们在各种热处理条件下系统地研究（TANB）0.7（HFZRTI）0.5 HEA的电流能力。我们获得了高临界场和大电流携带能力，这指向了乐观的应用。有趣的是，在HEA超导体中首次发现了鱼尾或第二峰效应，并且涡流固定力的位置显示在降低场的0.72处最大值，这与库酸酯和基于铁的高-TC超导体大不相同。与电阻测量值一起，可为Hea Superoductor获得涡流相图。
High-entropy alloy (HEA) is an attracting topic raising in materials science and condensed matter physics. Although several types of superconductors have been discovered in HEAs, the critical currents (Jc) of HEA superconductors remain uncharacterized up to now. Here, we systematically study the current-carrying ability of (TaNb)0.7(HfZrTi)0.5 HEA at various heat treatment conditions. We obtained the high upper critical field and large current carrying ability, which point to optimistic applications. Interestingly, the fishtail or second peak effect was found for the first time in HEA superconductors, and the position of the vortex pinning force shows a maximum at 0.72 of the reduced field, which is quite different from the cuprates and iron-based high-Tc superconductors. Together with the resistive measurements, the vortex phase diagram is obtained for HEA superconductor.
