arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0903.3539cond-mat.supr-concond-mat.mes-hall
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非对称超导环临界电流和持续电流的磁依赖性

Magnetic dependence of the critical and persistent current of asymmetric superconducting rings

V. L. Gurtovoi, S. V. Dubonos, A. V. Nikulov, N. N. Osipov, V. A. Tulin

摘要:

所获得的周期性磁场的临界电流的依赖关系,在相反的方向上测量的非对称超导铝环,允许解释观察到的直流电压作为交流整流的结果的早期量子振荡。据发现,高效率的整流的个别环和环系统连接到一个滞后的电流-电压特性。提供整流效应的电流-电压特性的不对称性是由于在相反方向上测量的临界电流的磁依赖性的相对移位。这种移位意味着临界电流最小值的位置不对应于n + 0.5磁通量量子,这与Little-Parks电阻振荡的测量结果直接矛盾。尽管存在这种矛盾,临界电流各向异性振荡的幅度及其随温度的变化与持续电流振荡的预期幅度及其随温度的变化相对应。

英文摘要:

The obtained periodic magnetic-field dependencies of the critical current, measured in opposite directions on asymmetric superconducting aluminum rings, allow to explain observed earlier quantum oscillations of a dc voltage as a result of alternating current rectification. It is found, that the high efficiency of the rectification of both individual rings and ring systems is connected to a hysteresis of the current-voltage characteristics. The asymmetry of the current-voltage characteristics providing the rectification effect is due to the relative shifts of the magnetic dependencies of the critical current measured in opposite directions. This shift means that position of the critical current minimums does not correspond to n + 0.5 magnetic flux quantum which is in the direct contradiction with measurement results of the Little-Parks resistance oscillations. Despite of this contradiction the amplitude of the critical current anisotropy oscillations and its variations with temperature correspond to expected amplitude of the persistent current oscillations and to its variations with temperature.

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