具有约瑟夫森涡旋内禀钉扎的分层超导体在磁场中的电流-电压特性
Current - voltage characteristics in magnetic field for layered superconductor with intrinsic pinning of Josephson vortices
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中文总结 AI 辅助
本研究测量了分层超导体Nd2-xCexCuO4在正交电磁场中的横向电压，发现约瑟夫森涡旋的临界退钉扎电流呈指数依赖，并观察到从涡旋蠕变到磁通流动的转变。
中文摘要 AI 辅助
本文报告了在正交磁场和电场作用下，分层高温超导体Nd2-xCexCuO4外延薄膜中电荷和涡旋子系统运动时，霍尔构型下横向电压Uy的测量结果。分析了约瑟夫森涡旋穿越CuO2层（沿c轴）的运动，并考虑了内禀钉扎效应。研究发现，约瑟夫森涡旋的临界退钉扎电流jc(B)呈指数依赖关系，这与阿布里科索夫涡旋的幂律依赖形成对比。随着外加磁场的增加，在磁场B=Bc处发生退钉扎后，观察到涡旋蠕变机制的开始，并在交叉场B=Bf处演变为磁通流动机制。
英文摘要
The results of measurements of the transverse voltage in the Hall configuration, Uy, under conditions of motion of the charge and vortex subsystems in orhtogonal magnetic and electric fields on epitaxial films of the layered high-temperature superconductor Nd2-xCexCuO4 are presented. the motion of Josephson vortices across CuO2 layers (along the c-axis) is analyzed considering the effects of intrinsic pinning. An exponential dependence of critical depinning current jc(B) for Josephson vortices is established in contrast to the power law dependences for Abrikosov vortices. With increasing external magnetic field after the depinning by a magnetic field at B=Bc, the onset of the vortex creep regime, which evolves into the flux-flow regime at crossover field B=Bf, is observed.
发表机构
- M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences（俄罗斯科学院乌拉尔分校 M.N. 米凯耶夫金属物理研究所）
- National Research Nuclear University MEPhI（国立核研究大学莫斯科工程物理学院）
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