Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 36: Focus Session: Ising Superconductivity in Monolayer Transition Metal Dichalcogenides (joint session TT/HL/MA)

MA 36.7: Vortrag

Donnerstag, 20. März 2025, 12:30–12:45, H36

Emergence of Unconventional Superconductivity and Doped Mott Physics in 6R-TaS₂ — •Yuxiao Ding¹, Amritroop Achari², Jonas Bekaert³, Jose Lado¹, Rahul R. Nair², Peter Liljeroth¹, and Somesh C. Ganguli¹ — ¹Aalto University, Finland — ²University of Manchester, UK — ³University of Antwerp, Belgium

Discovery of Unconventional superconductivity in van der Waals (vdW) materials have brought about a paradigm shift in modern condensed matter research for their tunability and potential application in quantum computing. Among these, most prevalent are 4Hb-TaS₂ and 6R-TaS₂. They comprise of alternating Mott insulating and metallic layers and give rise to exotic quantum states such as topological superconductivity, anomalous Hall effect potentially associated with hidden magnetism etc. We have studied, using low temperature STM/STS, the newly discovered vdW superconductor 6R-TaS₂. For the 1T phase, a doped Mott phase was observed with potential charge order occurring due to hybridisation between 1T and underlying 1H layer. We also observe Kondo sites in the half-filled regime, which unlike 4Hb-TaS₂, were more robust under the application of tip-induced electric field. This indicates significantly different interlayer interactions in these two systems. We also observe evidence of unconventional superconductivity in the 1H phase, indicated by the presence of V-shaped superconducting gap and many-body excitations. Our results pave a new direction in understanding the role of interplay between magnetism and superconductivity in layered unconventional superconductors.

Keywords: Unconventional superconductivity; Mott insulator; Kondo effect