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Issue 37, 2018
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Superconductivity in intercalated buckled two-dimensional materials: KGe2

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Abstract

Germanene has emerged as a novel two-dimensional material with various interesting properties and applications. Here we report the possibility of superconductivity in a stable potassium intercalated germanene compound, KGe2, with a transition temperature Tc ∼ 11 K, and an electron–phonon coupling of 1.9. Applying a 5% tensile strain, which reduces the buckling height by 4.5%, leads to the reduction of the electron–phonon coupling by 11% and a slight increase in Tc ∼ 12 K. That is, strong electron–phonon coupling results from the buckled structure of the germanene layers. Despite being an intercalated van der Waals material similar to intercalated graphite superconductors, it does not possess an occupied interlayer state.

Graphical abstract: Superconductivity in intercalated buckled two-dimensional materials: KGe2

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Publication details

The article was received on 31 May 2018, accepted on 05 Sep 2018 and first published on 05 Sep 2018


Article type: Paper
DOI: 10.1039/C8CP03446J
Phys. Chem. Chem. Phys., 2018,20, 24027-24032

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    Superconductivity in intercalated buckled two-dimensional materials: KGe2

    S. A. Tawfik, C. Stampfl and M. J. Ford, Phys. Chem. Chem. Phys., 2018, 20, 24027
    DOI: 10.1039/C8CP03446J

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