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      Classifying superconductivity in Moiré graphene superlattices

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          Abstract

          Several research groups have reported on the observation of superconductivity in bilayer graphene structures where single atomic layers of graphene are stacked and then twisted at angles θ forming Moiré superlattices. The characterization of the superconducting state in these 2D materials is an ongoing task. Here we investigate the pairing symmetry of bilayer graphene Moiré superlattices twisted at θ = 1.05°, 1.10° and 1.16° for carrier doping states varied in the range of n = (0.5 − 1.5) · 10 12cm −2 (where superconductivity can be realized) by analyzing the temperature dependence of the upper critical field B c2( T) and the self-field critical current J c(sf, T) within currently available models – all of which start from phonon-mediated BCS theory – for single- and two-band s−, d−, p− an d d +  id-wave gap symmetries. Extracted superconducting parameters show that only s-wave and a specific kind of p-wave symmetries are likely to be dominant in bilayer graphene Moiré superlattices. More experimental data is required to distinguish between the s- and remaining p-wave symmetries as well as the suspected two-band superconductivity in these 2D superlattices.

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          Temperature and Purity Dependence of the Superconducting Critical Field,Hc2. III. Electron Spin and Spin-Orbit Effects

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            Superconductivity in the Presence of Strong Pauli Paramagnetism: CeCu2Si2

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                Author and article information

                Contributors
                evgeny.talantsev@imp.uran.ru
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                14 January 2020
                14 January 2020
                2020
                : 10
                : 212
                Affiliations
                [1 ]ISNI 0000 0001 2192 9124, GRID grid.4886.2, M.N. Miheev Institute of Metal Physics, Ural Branch, , Russian Academy of Sciences, ; 18, S. Kovalevskoy St., Ekaterinburg, 620108 Russia
                [2 ]ISNI 0000 0004 0645 736X, GRID grid.412761.7, NANOTECH Centre, , Ural Federal University, ; 19 Mira St., Ekaterinburg, 620002 Russia
                [3 ]ISNI 0000 0001 2292 3111, GRID grid.267827.e, Robinson Research Institute, , Victoria University of Wellington, ; 69 Gracefield Road, Lower Hutt, 5040 New Zealand
                [4 ]GRID grid.482895.a, MacDiarmid Institute for Advanced Materials and Nanotechnology, ; P.O. Box 33436, Lower Hutt, 5046 New Zealand
                [5 ]ISNI 0000000108389418, GRID grid.5373.2, Aalto University, Foundation sr, ; PO Box 11000, FI-00076 AALTO, Finland
                Author information
                http://orcid.org/0000-0001-8970-7982
                http://orcid.org/0000-0003-0892-5430
                http://orcid.org/0000-0002-3904-0996
                Article
                57055
                10.1038/s41598-019-57055-w
                6959361
                31937784
                1eef8217-b9e8-412b-a483-d6430c1a675e
                © The Author(s) 2020

                Open Access 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/.

                History
                : 14 May 2019
                : 20 December 2019
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                © The Author(s) 2020

                Uncategorized
                superconducting properties and materials,electronic properties and devices

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