Josephson mechanism in random telegraph voltage noise in high-Tc superconductors

G Jung , B Savo
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Abstract

Random telegraph voltage noise signals characterized by strongly nonlinear and nonmonotonic dependence of the telegraph amplitude on current flow has been observed in good quality epitaxial BiSrCaCuO thin film strips biased with d.c. current flow and immersed in an external magnetic field. The shape of the amplitude dependence on current flow closely resembled that observed previously in granular films, where intergranular Josephson junctions were involved in noise generation. The dependence of noise amplitude on bias current and magnetic field in epitaxial films is discussed in the context of the possible Josephson flux-to-voltage conversion mechanism.

高温超导体随机电报电压噪声中的约瑟夫森机制
在直流偏置的高质量BiSrCaCuO外延薄膜中,在外加磁场中观察到随机电报电压噪声信号,其特征是电报幅值与电流有强烈的非线性和非单调依赖性。振幅依赖于电流的形状与先前在颗粒膜中观察到的非常相似,其中颗粒间约瑟夫森结参与了噪声的产生。在可能的约瑟夫森磁通-电压转换机制的背景下,讨论了外延薄膜中噪声振幅与偏置电流和磁场的关系。
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