Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 68: Superconductivity: Properties and Electronic Structure
TT 68.8: Vortrag
Donnerstag, 21. März 2024, 11:30–11:45, H 3010
Control of the superconducting pairing in the van der Waals superconductor NbSe2 via magnetic intercalation — •Mohammad Hemmati1,2, Stefan Blügel1,2, and Philipp Rüßmann1,3 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Jülich, Germany — 2RWTH Aachen University, Aachen, Germany — 3Institute for Theoretical Physics and Astrophysics, University of Würzburg, Würzburg, Germany
We investigate the superconducting properties of NbSe2 using first-principles calculations within the Korringa-Kohn-Rostoker Green function method, accompanied by a description of superconductivity via the Bogoliubov-de Gennes formalism [1]. The Coherent Potential Approximation (CPA) is employed to address the effects of magnetic transition-metal impurities on the electronic structure [2]. Adding low concentrations of randomly placed magnetic atoms inside the van der Waals gap of superconducting NbSe2 influences the superconducting order parameter before suppressing the superconductivity at larger impurity concentrations. This allows us to control the superconducting pairing and engineer the triplet order parameter in NbSe2 with varying concentration and chemical composition of magnetic the impurities.
— This work was supported by the ML4Q Cluster of Excellence (EXC 2004/1 * 390534769).
[1] P. Rüßmann and S. Blügel, Phys. Rev. B 105 (2022) 125143.
[2] P. Rüßmann, D. Silva, M. Hemmati et al., Spintronics XVI (2023) 12656.
Keywords: Superconducting pairing; density functional theory; magnetic impurities; random alloy