硼掺杂对中子辐照熔融织构Y_1.6Ba_2.3Cu_3.3O_7-x样品微波表面电阻的影响
Effect of boron doping in the microwave surface resistance of neutron irradiated melt-textured Y_1.6Ba_2.3Cu_3.3O_7-x samples
摘要：
本文报道了不同B_2O_3掺杂量的熔融织构Y_1.6Ba_2.3Cu_3.3O_7-x样品在1.476 \times 10^17 cm^-2热中子辐照下的微波表面电阻。测量了微波表面电阻随温度和直流磁场的变化。实验结果进行了定量讨论的科菲和克莱姆理论的框架内，适当地适应考虑到d波性质的铜氧化物超导体。通过对零直流电场下的实验数据进行拟合，我们突出了感生缺陷对样品一般性质的影响，包括晶间区。在高直流电场下得到的结果的分析，使我们能够调查磁通动力学和推导出脱钉频率，特别是，我们已经表明，添加B_2O_3高达0.1wt%的有效性增加的缺陷，阻碍磁通运动引起的微波电流。
英文摘要：
We report on the microwave surface resistance of melt-textured Y_1.6Ba_2.3Cu_3.3O_7-x samples, doped with different amount of B_2O_3 and, subsequently, irradiated by thermal neutrons at the fluence of 1.476 \times 10^17 cm^-2. The microwave surface resistance has been measured as a function of temperature and DC magnetic field. The experimental results are quantitatively discussed in the framework of the Coffey and Clem theory, properly adapted to take into account the d-wave nature of cuprate superconductors. By fitting the experimental data at zero DC field, we have highlighted the effects of the induced defects in the general properties of the samples, including the intergranular region. The analysis of the results obtained at high DC fields allowed us to investigate the fluxon dynamics and deduce the depinning frequency; in particular, we have shown that the addition of B_2O_3 up to 0.1 wt% increases the effectiveness of the defects to hinder the fluxon motion induced by the microwave current.
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