Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 24: Focus Session: Quantum Sensing with Solid State Spin defects I (joint session TT/MA)

TT 24.6: Vortrag

Dienstag, 10. März 2026, 12:15–12:30, HSZ/0003

Probing Vortex Dynamics in 2D Superconductors with Scanning Quantum Microscope — •Malik Lenger¹, Sreehari Jayaram¹, Lucas Pupim², Ruoming Peng¹, Mathias Scheurer², Jurgen Smet³, and Jörg Wrachtrup^{1, 3} — ¹3rd Institute of Physics, University Stuttgart, Stuttgart, Germany — ²Institute for Theoretical Physics III, University Stuttgart, Stuttgart, Germany — ³Max Planck Institute for Solid State Research, Stuttgart, Germany

Magnetic dynamics at the nanoscale provide crucial insight into the behavior of superconductors. Using single-spin scanning quantum microscopy, we probe vortex dynamics in the two-dimensional superconductor NbSe2. Our measurements reveal a disordered vortex glass phase that melts near the critical temperature and displays cooling-rate-dependent configurations. Surprisingly, magnetic noise persists well below Tc, with a strength that increases at lower temperatures - contrary to expectations. This behavior, detected via spin decoherence, points to an intrinsic origin driven by competition between supercurrent density and thermal fluctuations. Our results establish single-spin microscopy as a powerful platform for investigating fluctuations in 2D superconductors.

Keywords: Superconductivity; Vortices in superconductors; Transition metal dichalcogenides; Type-II superconductors; Scanning probe microscopy