Critical currents, phase slip centers, and phase slip lines in superconducting films in the absence of external magnetic field
Critical currents, phase slip centers, and phase slip lines in superconducting films in the absence of external magnetic field
复制标题
无外磁场时超导薄膜中的临界电流、相滑中心和相滑线
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
E. V. Khristenko
中科院分区：
文献类型：
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作者：
V. Dmitriev;I. V. Zolochevskiĭ;T. V. Salenkova;E. V. Khristenko
在无外磁场条件下，研究了厚度为7 ~ 50 μm的高质量TiN薄膜的电流-电压特性随温度的变化。对于第一次在相同的样品上观察到的相位滑移中心附近的Tc，在那里的薄膜是狭窄的通道，并在较低的温度下观察到的相位滑移线，在那里的薄膜变得宽。临界电流表现出温度交叉，这影响其绝对值，但在一定的温度区间内，保持形式为（1-T/Tc）3/2的温度依赖性。当温度进一步降低时，由于电流的自场而产生的涡旋可以进入样品的临界电流线性地依赖于温度，并且对应于Aslamazov-Lempitsky理论。随着温度的降低，交叉开始时的温度与薄膜宽度等于垂直于薄膜平面的弱磁场穿透深度的四倍时的温度相一致。
The temperature dependence of the current–voltage characteristics of high-quality thin films of tin from 7 to 50 μm thick is investigated in the absence of external magnetic field. For the first time on the same samples phase slip centers are observed near Tc, where the films are narrow channels, and phase slip lines are observed at lower temperatures, where the films become wide. The critical current exhibits temperature crossover, which affects its absolute value, but in a certain temperature interval a temperature dependence of the form (1−T/Tc)3/2 is maintained. When the temperature is decreased further, the critical current at which vortices due to the self-field of the current can enter the sample depends linearly on temperature and corresponds to the Aslamazov–Lempitsky theory. The temperature at the start of crossover with decreasing temperature coincides with the temperature at which the film width is equal to four times the penetration depth of a weak magnetic field perpendicular to the film pla...