Thickness dependence of the second magnetization peak effect in Ba0.6K0.4Fe2As2 single crystals

IF 5.6 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Yu-Hao Liu , Wei Xie , Hai-Hu Wen
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引用次数: 0

Abstract

The second magnetization peak (SMP) effect has been observed widely in many type-II superconductors, but the reason remains elusive. This effect manifests an enhanced critical current density with magnetic field and should be very useful for applications. By measuring the magnetization of optimally doped Ba0.6K0.4Fe2As2 single crystals with different thickness, it is found the SMP effect exists in thick samples and gradually becomes invisible when the sample thickness is reduced to the scale of micrometer. Detailed investigation on the vortex dynamics on samples with different thickness clearly show that there is a common behavior of vortex dynamics in the low field region, which may be characterized by the Bragg glass like elastic vortex motion. This feature holds on in the whole field region for the thin samples, while it turns into the SMP effect for thicker samples when the field is increased. The results suggest that the SMP effect may be induced by the entanglement of the vortex system, and the absence of the SMP effect in thin samples is attributed to the cutoff of the entangled vortex length along c-axis.
Ba0.6K0.4Fe2As2单晶中第二磁化峰效应的厚度依赖性
第二磁化峰(SMP)效应在许多ii型超导体中被广泛观察到,但其原因尚不清楚。这一效应表现为磁场作用下临界电流密度的增强,在实际应用中应该是非常有用的。通过测量不同厚度的最佳掺杂Ba0.6K0.4Fe2As2单晶的磁化强度,发现SMP效应在较厚的样品中存在,当样品厚度减小到微米尺度时,SMP效应逐渐消失。对不同厚度样品的涡动力学进行了详细的研究,表明在低场区存在着涡动力学的共同行为,可以用类似布拉格玻璃的弹性涡运动来表征。对于较薄的样品,这一特征在整个场域中保持不变,而对于较厚的样品,随着场的增加,它变成了SMP效应。结果表明,SMP效应可能是由涡旋系统的纠缠引起的,而薄样品中没有SMP效应是由于纠缠涡旋沿c轴的长度被切断。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
3.90
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