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Open AccessArticle

Evaluating Superconductors through Current Induced Depairing

Department of Physics and Astronomy, University of South Carolina, Columbia, SC 29208, USA
Condens. Matter 2019, 4(2), 54; https://doi.org/10.3390/condmat4020054
Received: 22 May 2019 / Revised: 13 June 2019 / Accepted: 15 June 2019 / Published: 17 June 2019
(This article belongs to the Special Issue From cuprates to Room Temperature Superconductors)
The phenomenon of superconductivity occurs in the phase space of three principal parameters: temperature T, magnetic field B, and current density j. The critical temperature T c is one of the first parameters that is measured and in a certain way defines the superconductor. From the practical applications point of view, of equal importance is the upper critical magnetic field B c 2 and conventional critical current density j c (above which the system begins to show resistance without entering the normal state). However, a seldom-measured parameter, the depairing current density j d , holds the same fundamental importance as T c and B c 2 , in that it defines a boundary between the superconducting and normal states. A study of j d sheds unique light on other important characteristics of the superconducting state such as the superfluid density and the nature of the normal state below T c , information that can play a key role in better understanding newly-discovered superconducting materials. From a measurement perspective, the extremely high values of j d make it difficult to measure, which is the reason why it is seldom measured. Here, we will review the fundamentals of current-induced depairing and the fast-pulsed current technique that facilitates its measurement and discuss the results of its application to the topological-insulator/chalcogenide interfacial superconducting system. View Full-Text
Keywords: vortex; vortices; theory vortex; vortices; theory
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Kunchur, M.N. Evaluating Superconductors through Current Induced Depairing. Condens. Matter 2019, 4, 54.

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