Recently, it has been demonstrated that the Hexatic vortex fluid realized in 2-dimensional vortex state of a very weakly pinned amorphous MoGe thin film is extremely sensitive to external ac excitation. A large amplification of resistance is observed when the sample is exposed to external electromagnetic radiation or a small ac current is superimposed with the subcritical measuring dc current. The observed resistance strongly depends on both amplitude and frequency of the ac excitation. In this paper, we develop an inertial model of vortex lattice subjected to a small amplitude of ac current, by extending the flux creep theory. We show that the resistance increases exponentially with both amplitude and frequency of the ac current and explain quantitatively the variation of resistance with the amplitude and frequency of ac current using the presented model.

最近，已经证明以极弱钉扎的非晶态MoGe薄膜的二维涡旋状态实现的六边形涡旋流体对外部交流激励极为敏感。当样品暴露于外部电磁辐射或在亚临界测量直流电流上叠加了小交流电流时，会观察到电阻的大幅度放大。观察到的电阻在很大程度上取决于交流激励的幅度和频率。在本文中，我们通过扩展通量蠕变理论，建立了一个在交流电流幅值较小的情况下涡旋晶格的惯性模型。