SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Superconductivity: Properties and Electronic Structure
TT 3.4: Vortrag
Montag, 27. März 2023, 10:15–10:30, HSZ 103
Tuning metal/superconductor to insulator/superconductor coupling via control of proximity enhancement between NbSe2 monolayers — •O. Chiatti1, K. Mihov1, T. Griffin1, C. Grosse1, L. Grote1, K. Hite2, D. Hamann2, M. B. Alemayehu2, A. Mogilatenko3, D. C. Johnson2, and S. F. Fischer1 — 1Novel Materials Group, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Solid State Chemistry, University of Oregon, Eugene OR 97403-1253, U.S.A. — 3Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, 12489 Berlin, Germany
The interplay between charge transfer and electronic disorder in transition-metal dichalcogenide multilayers [1] gives rise to superconductive coupling driven by proximity enhancement, tunneling and superconducting fluctuations. Artificial spacer layers introduced with atomic precision change the density of states by charge transfer. Here, we tune the superconductive coupling between NbSe2 monolayers from proximity-enhanced to tunneling-dominated and correlate normal and superconducting properties in [(SnSe)1 + δ)]m[NbSe2]1 tailored multilayers with varying SnSe layer thickness (m=1-15). We show cross-overs between three regimes: metallic with proximity-enhanced coupling, disordered-metallic with intermediate coupling and insulating with Josephson tunneling. [1] A. Devarakonda et al., Science 370, 231 (2020) [2] M. Trahms et al., Supercond. Sci. Technol. 31, 065006 (2018)