Defects related vortex dynamics behaviors in the ‘1144’-type iron-based superconductors

凝聚态物理 超导电性 涡流 磁通钉扎 Ⅱ型超导体 磁化 材料科学 钉扎力 磁通量 磁场 高温超导 物理 临界电流 机械 量子力学
作者
Y. W. Li,Cong Liu,Dong Chen,Xiaolei Yi,L. C. Wang,Qingbin Tang,F. S. Li,Chunlei Wang,Benhai Yu,Yanwei Ma
出处
期刊:Superconductor Science and Technology [IOP Publishing]
标识
DOI:10.1088/1361-6668/ada58a
摘要

Abstract We have synthesized ‘1144’- type (Ca1-xPrxKFe4As4 and CaKFe4As4), and ‘122’-type (Ba0.6K0.4Fe2As2 and Ba0.6Rb0.4Fe2As2) iron-based superconductors. Based on these crystals, we have investigated the vortex dynamics of the ‘1144’- and ‘122’-type iron-based superconductors. The results indicate that the novel flux dynamics behaviors of ‘1144’-type iron-based superconductors are closely related to their defect structures. Firstly, the intergrowths in ‘1144’-type superconductors can function as columnar defects under the applied magnetic field H // ab-plane, which results in a dip structure in the magnetization hysteresis loops (MHLs) near zero field due to the self-field effect. Secondly, the intergrowths as strong pinning sites provide a large pulling force to the flux lines and cause a small magnetization peak at temperatures below 10 K under magnetic fields from about 3 to 7 T in MHLs for the ‘1144’-type superconductors. Thirdly, there may be a vortex entanglement due to the presence of strong pinning centers, which impedes the Elastic to Plastic motion of vortices (E-P phase transition) resulting in a weak second magnetization peak (SMP) effect in the bulk ‘1144’-type superconductors. Fourthly, the intergrowths introduce disorder into the superconductors and accelerate the magnetic 3D-to-2D transition, which causes the thickness-dependent Jc and SMP effect due to the rigidity of flux lines with the reducing sample thickness. The present results are significant for us to understand the relationship between the flux pinning behaviors and the defect structures for a superconductor.
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