Probing Vortex Dynamics in 2D Superconductors with Scanning Quantum Microscope
Sreehari Jayaram, Malik Lenger, Dong Zhao, Lucas Pupim, Takashi Taniguchi, Kenji Watanabe, Ruoming Peng, Marc Scheffler, Rainer Stöhr, Mathias S. Scheurer, Jurgen Smet, Jörg Wrachtrup
DOI 10.1103/1fzm-pb1d · Physical Review Letters
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.8 | Pressure not reported | unknown |
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