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arXiv · 1909.01707

Experimental test of strong pinning and creep in current-voltage characteristics of type II superconductors

Martin Buchacek·Zhi-Li Xiao·Surajit Dutta·Eva Y. Andrei·Pratap Raychaudhuri·Vadim B. Geshkenbein·Gianni Blatter
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Abstract

Pinning and creep determine the current--voltage characteristic of a type II superconductor and thereby its potential for technological applications. The recent development of strong pinning theory provides us with a tool to assess a superconductor's electric properties in a quantitative way. Motivated by the observation of typical excess-current characteristics and field-scaling of critical currents, here, we analyze current--voltage characteristics measured on 2H-NbSe$_2$ and $a$-MoGe type II superconductors within the setting provided by strong pinning theory. The experimentally observed shift and rounding of the voltage-onset is consistent with the predictions of strong pinning in the presence of thermal fluctuations. We find the underlying parameters determining pinning and creep and discuss their consistency.

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Martin Buchacek, Zhi-Li Xiao, Surajit Dutta, Eva Y. Andrei, Pratap Raychaudhuri, Vadim B. Geshkenbein, Gianni Blatter. 2019-09-04. Experimental test of strong pinning and creep in current-voltage characteristics of type II superconductors. https://doi.org/10.1103/physrevb.100.224502

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