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

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. M...

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Bibliographic Details
Published in:arXiv.org 2019-09
Main Authors: Buchacek, Martin, Zhi-Li, Xiao, Dutta, Surajit, Andrei, Eva Y, Raychaudhuri, Pratap, Geshkenbein, Vadim B, Blatter, Gianni
Format: Article
Language:English
Subjects:
Current voltage characteristics
Electric properties
Pinning
Rounding
Variations
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1909.01707