Nonuniform and coherent motion of superconducting vortices in the picometer-per-second regime
Jonghee Lee, Hui Wang, Michael Dreyer, Helmuth Berger, Barry I. Barker
DOI 10.1103/PhysRevB.84.060515 · Physical Review B
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Abstract
We investigated vortex dynamics in a single-crystal sample of type-II superconductor NbSe2 using scanning tunneling microscopy at 4.2 K. The decay of the magnetic field at a few nT/s in our superconducting magnet induced the corresponding motion of vortices at a few pm/s. Starting with an initial magnetic field of 0.5 T, we continued to observe motion of vortices within a field of view of 400×400 nm2 subject to decay of the magnetic field over a week. Vortices moved collectively, and maintained triangular lattices due to strong vortex-vortex interactions during the motion. However, we observed two peculiar characteristics of vortex dynamics in this superconductor. First, the speed and direction of the vortex lattice motion were not uniform in time. Second, despite the nonuniform motion, we also found that there exists an energetically favored configuration of the moving vortices in the single-crystal sample of NbSe2 based on the overlaid trajectories and their suppressed speeds. We model the system with weak bulk pinning, strong bulk pinning, and edge barrier effects.
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. | — | Pressure not reported | unknown |
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