Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 99: Spins on surfaces at the atomic scale III
O 99.5: Vortrag
Freitag, 13. März 2026, 10:30–10:45, WILL/A317
Revealing spatial inhomogeneities in superconducting 2H-NbS2 using magnetic sensor atoms — •Werner M.J. van Weerdenburg, Margarete Huisinga, Constantin Flommersfeld, Lisa M. Rütten, and Katharina J. Franke — FachbereichPhysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
Transition metal dichalcogenides (TMDCs) are an interesting material class in which multiple quantum phases such as charge-density-wave (CDW) order, superconductivity and pair-density-wave order may coexist [1]. Within the family of superconducting TMDCs, 2H-NbS2 stands out as the only material that does not develop a CDW phase, but this interpretation is challenged in the presence of defects, since the material is very close to a lattice instability [2,3].
Here, we present how magnetic adatoms on a superconducting TMDC substrate can be used to investigate spatial inhomogeneities of 2H-NbS2. By manipulating an individual Fe atom between binding sites with the tip of a scanning tunneling microscope, we probe the Yu-Shiba-Rusinov (YSR) states and their response to surface variations with high energy resolution. The sensitivity of YSR states to the crystal field, density of states and disorder allows us to analyze the relation between the YSR energies and the properties of the substrate, and to find indications of local charge-density-wave nucleation around intrinsic defects.
[1] Liu et al., Science 372, 1447-1452 (2021);
[2] Heil et al., PRL 119, 087003 (2017);
[3] Wen et al., PRB 101, 241404 (2020)
Keywords: Transition metal dichalcogenides; Yu-Shiba-Rusinov states; Superconductivity; Charge density wave; STM