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arXiv 1202.5963cond-mat.supr-con
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超导共面微波谐振器的磁滞效应

Magnetic hysteresis effects in superconducting coplanar microwave resonators

Daniel Bothner, Tobias Gaber, Matthias Kemmler, Dieter Koelle, Reinhold Kleiner, Stefan Wünsch, Michael Siegel

摘要:

我们在温度T= 4.2K的共面半波长铌谐振腔上进行了透射光谱实验。我们观察到不仅强烈依赖于外部施加的磁场的品质因数Q和共振频率f_res,但也对我们的共振器的磁历史,即在设备中的被困Abrikosov涡的空间分布。我们发现,这些结果是有效的谐振器平面和磁场方向之间的频率和角度的广泛范围内,以及为谐振器,没有反点附近的中心导体和接地平面的边缘。在一个详细的分析中,我们表明,实验数据的特征只能在计算中再现,如果一个高度不均匀的射频电流密度和最大值的超导体的边缘的磁通密度梯度被假定。我们还证明,谐振器特性的滞后行为可以用来大大减少涡流引起的损耗,并通过适当的方式循环到所需的磁场来微调谐振频率。

英文摘要:

We performed transmission spectroscopy experiments on coplanar half wavelength niobium resonators at a temperature T=4.2 K. We observe not only a strong dependence of the quality factor Q and the resonance frequency f_res on an externally applied magnetic field but also on the magnetic history of our resonators, i.e. on the spatial distribution of trapped Abrikosov vortices in the device. We find these results to be valid for a broad range of frequencies and angles between the resonator plane and the magnetic field direction as well as for resonators with and without antidots near the edges of the center conductor and the ground planes. In a detailed analysis we show, that characteristic features of the experimental data can only be reproduced in calculations, if a highly inhomogeneous rf-current density and a flux density gradient with maxima at the edges of the superconductor is assumed. We furthermore demonstrate, that the hysteretic behaviour of the resonator properties can be used to considerably reduce the vortex induced losses and to fine-tune the resonance frequency by the proper way of cycling to a desired magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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