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TT: Fachverband Tiefe Temperaturen

TT 37: Graphene and 2D Materials (joint session TT/HL)

TT 37.1: Talk

Wednesday, March 20, 2024, 09:30–09:45, H 3007

Static and Dynamic Properties of a 2D Superconductor Investigated by NV Center SPM — •Sreehari Jayaram, Malik Lenger, Ruoming Peng, Rainer Stöhr, and Jörg Wrachtrup — 3rd Physics Institute, University of Stuttgart, Germany

Visualization of nanoscale dynamics in superconducting materials provides a pathway to unravel the pairing mechanisms of interacting electrons. Here, we have employed the state-of-the-art scanning NV probe technique to explore the local magnetic response of the 2D superconductor, 2H-NbSe₂, in which we demonstrate full dynamic sensing of vortices with high sensitivity and spatial resolution.

Utilizing this quantum probe, we present the first spatio-temporal dynamics of vortices in a 10 nm thin exfoliated 2H-NbSe₂, where the arrangement of the vortices show a strong correlation with the geometric confinement. Notably, we have observed the melting of vortex solids near critical temperature allowing the re-arrangement of the vortices that is governed by the cooling rate.

Additionally, our study delves into the dynamics of vortex cores, superconducting-insulator edge dynamics, and phase transitions, all unveiled through spatial-temporal noise spectroscopy with the NV probe.

Keywords: NV; NbSe2; Superconductivity; Scanning Probe