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TT: Fachverband Tiefe Temperaturen
TT 92: Transport – Poster
TT 92.5: Poster
Donnerstag, 12. März 2026, 18:00–20:00, P4
Probing Vortices in Superconductors with Scanning Quantum Microscope — •Sreehari Jayaram1, Malik Lenger1, Lucas Pipim3, Ruoming Peng1, Rainer Stoehr1, Mathias S. Scheurer3, Jurgen Smet2, and Joerg Wrachtrup1,2 — 13rd Institute of Physics, University of Stuttgart, Allmandring 13, Stuttgart 70569, Germany — 2Max Planck Institute for Solid State Research, Heisenbergstrasse 1, Stuttgart 70569, Germany — 3Institute for Theoretical Physics III, University of Stuttgart, Pfaffenwaldring 57, Stuttgart 70569, 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 superconductors. Our measurements reveal a disordered vortex glass phase that melts near the critical temperature. Magnetic noise persists well below **, 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: NV Center; Quantum Sensing; NbSe2; YBCO; Noise