多晶Pr_{x} Y_{1-x} Ba_2Cu_3O_7中晶界Josephson网络的异常强相干响应
Unusually strong coherent response from grain-boundary Josephson network in polycrystalline Pr_{x}Y_{1-x}Ba_2Cu_3O_7
摘要：
用自制的高灵敏度交流磁化率测量仪测量了Pr_{x} Y_{1-x} Ba_2Cu_3O_7多晶（x= 0.0，0.1和0.3）的交流磁化率，观察到交流磁化率实部的Fraunhofer型低场周期性振荡，这是由于约瑟夫森涡旋穿过晶界约瑟夫森网络的晶间区所致。假设单结接触面积的洛伦兹型分布，我们能够成功地拟合实验数据。
英文摘要：
By applying a highly sensitive homemade AC susceptibility technique to Pr_{x}Y_{1-x}Ba_2Cu_3O_7 polycrystals (with x=0.0, 0.1 and 0.3), we observed very sharp Fraunhofer type low-field periodic oscillations of the real part of the AC susceptibility which were attributed to Josephson vortices penetrating intergranular regions of grain-boundary Josephson network in our samples. Assuming the Lorentz type distribution of single-junction contact areas, we were able to successfully fit the experimental data.
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