用互感法研究$YB_2C_3O_{7-δ}$薄膜的交流复极化率高次谐波
Study of higher-order harmonics of complex ac susceptibility in $YB_2C_3O_{7-δ}$ thin films by the mutual inductive method
摘要：
我们应用互感方法研究了$ $YB_2C_3O_{7-δ}$薄膜的复交流磁化率$χ_n=χ'_n-iχ"_n$的高次谐波随温度和外加磁场的变化。实验结果进行了比较，从石田-马扎基模型和电流密度的积分方程的解决方案，分别获得的分析和数值计算结果。这两种模型都使我们能够再现主要的实验特征，然而，随着$n$的增加，数值模型显示出显着的差异。该故障可归因于电流-电压特性。此外，该研究还得到了两个样品在T=0时的活化能$U_c$和临界电流密度$J_c$。
英文摘要：
We have applied the mutual inductive method to study higher-order harmonics of complex ac susceptibility $χ_n=χ'_n-iχ"_n$ for $$YB_2C_3O_{7-δ}$ thin films as function of the temperature and the applied field. The experimental results were compared with analytical and numerical results obtained from the Ishida-Mazaki model and the solution of the integral equation for the current density, respectively. Both models allow us to reproduced the main experimental features, however, as $n$ increases the numerical model shows notable discrepancies. This failure can be attributed to the current-voltage characteristics. Also this investigation yields the activation energy $U_c$ and the critical current density $J_c$ for two samples both at T=0.
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