本课题将利用中科院强磁场科学中心提供的强磁场实验装置对122相铁基超导体（包括基于AxFe2-ySe2和基于BaFe2As2的超导体）的磁通动力学行为进行研究。. 利用强磁场下的输运性质测试系统（16特斯拉物理性质测试系统和35特斯拉水冷系统），对122相铁基超导体在不同外加磁场和温度下的R-T曲线，R-H曲线和I-V曲线进行测量，探索这两个体系在存在铁位缺陷和不存在铁位缺陷的情况下，在不同磁场和电流下的磁通蠕动行为和磁通流动行为。目的在于揭示这两类超导体中铁位缺陷对磁通钉扎行为的影响和关联，以及磁通钉扎对超导电性的影响，为更深入地理解磁性与超导电性的关系提供直观的实验证据和物理图象，并为铁基超导体在未来产业发展中的应用前景提供临界指标。

In this project, we will study the magnetic flux dynamics of the so-called 122-phase iron-based superconductors (including the AxFe2-ySe2-based superconductors and the BaFe2As2-based superconductors) using the high-magnetic field experimental facilities provided by High Magnetic Field Laboratory of Chinese Academy of Sciences.. Using the high magnetic field transport property measurement system (16 Tesla Physical Property Measurements System and 35 Tesla water-cooled system), the R-T curves, R-H curves, and I-V curves under different external magnetic field and temperature will be measured on the 122-phase iron-based superconductors. We will explore the flux creep behavior and the flux flow behavior at different magnetic field and current of the above-mentioned two systems where there either exist iron-site vacancy or has no iron-site vacancy. The purpose of this work is to reveal the influence of iron-site vacancy on the flux dynamics behavior as well as the influence of vortex pinning on the superconductivity. We will try to provide some direct experimental evidence and physical model which will be helpful in understanding the relationship between magnetism and superconductivity. And we will provide the critical application exponents of the iron-based superconductors in future industrial developments.