Venditti, G. and Biscaras, J. and Hurand, S. and Bergeal, N. and Lesueur, J. and Dogra, A. and Budhani, R. C. and Mondal, Mintu and Jesudasan, John and Raychaudhuri, Pratap and Caprara, S. and Benfatto, And L. (2019) Nonlinear I-V characteristics of two-dimensional superconductors: Berezinskii-Kosterlitz-Thouless physics versus inhomogeneity. Physical Review B, 100 (6). 064506- 064513. ISSN 2469-9950

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Abstract

One of the hallmarks of the Berezinskii-Kosterlitz-Thouless (BKT) transition in two-dimensional superconductors is the universal jump of the superfluid density that can be indirectly probed via the nonlinear exponent of the current-voltage I-V characteristics. Here, we compare the experimental measurements of I-V characteristics in two cases, namely NbN thin films and SrTiO3-based interfaces. While the former display a paradigmatic example of BKT-like nonlinear effects, the latter do not seem to justify a BKT analysis. Rather, the observed I-V characteristics can be well reproduced theoretically by modeling the effect of mesoscopic inhomogeneity of the superconducting state. Our results offer an alternative perspective on the spontaneous fragmentation of the superconducting background in confined two-dimensional systems.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s American Physical Society.
Subjects:	Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	31 Dec 2020 11:14
Last Modified:	31 Dec 2020 11:14
URI:	http://npl.csircentral.net/id/eprint/4301

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