Emergence of superconductivity in the cuprates via a universal percolation process

Pelc, Damjan and Vučković, Marija and Grbić, Mihael Srđan and Požek, Miroslav and Yu, Guichuan and Sasagawa, Takao and Greven, Martin and Barišić, Neven (2018) Emergence of superconductivity in the cuprates via a universal percolation process. Nature Communications, 9 (1). p. 4327. ISSN 2041-1723

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Abstract

A pivotal step toward understanding unconventional superconductors would be to decipher how superconductivity emerges from the unusual normal state. In the cuprates, traces of superconducting pairing appear above the macroscopic transition temperature Tc, yet extensive investigation has led to disparate conclusions. The main difficulty has been to separate superconducting contributions from complex normal state behaviour. Here we avoid this problem by measuring nonlinear conductivity, an observable that is zero in the normal state. We uncover for several representative cuprates that the nonlinear conductivity vanishes exponentially above Tc, both with temperature and magnetic field, and exhibits temperature-scaling characterized by a universal scale Ξ0. Attempts to model the response with standard Ginzburg-Landau theory are systematically unsuccessful. Instead, our findings are captured by a simple percolation model that also explains other properties of the cuprates. We thus resolve a long-standing conundrum by showing that the superconducting precursor in the cuprates is strongly affected by intrinsic inhomogeneity.

Item Type: Article
Keywords: percolation, cuprates, superconductivity, nonlinear conductivity, universal
Date: 2018
Number of Pages: 10
Subjects: NATURAL SCIENCES > Physics
Additional Information: © The Author(s) 2018. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Received 03 April 2018. Accepted 07 September 2018. Published 18 October 2018.
Divisions: Faculty of Science > Department of Physics
Project code: IP-2013-11-2729
Publisher: Nature Publishing Group
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 08 Mar 2019 14:55
Last Modified: 08 Mar 2019 14:55
URI: http://digre.pmf.unizg.hr/id/eprint/5882

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