Ultra-fast vortex motion in dirty Nb-C superconductor with a close-to-perfect edge barrier
| Autor: | Dobrovolskiy, O. V., Vodolazov, D. Yu., Porrati, F., Sachser, R., Bevz, V. M., Mikhailov, M. Yu., Chumak, A. V., Huth, M. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Nature Communications 11, 3291 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41467-020-16987-y |
| Popis: | The ultra-fast dynamics of superconducting vortices harbors rich physics generic to nonequilibrium collective systems. The phenomenon of flux-flow instability (FFI), however, prevents its exploration and sets practical limits for the use of vortices in various applications. To suppress the FFI, a superconductor should exhibit a rarely achieved combination of properties: weak volume pinning, close-to-depairing critical current, and fast heat removal from heated electrons. Here, we demonstrate experimentally ultra-fast vortex motion at velocities of 10-15 km/s in a directly written Nb-C superconductor in which a close-to-perfect edge barrier orders the vortex motion at large current values. The spatial evolution of the FFI is described using the edge-controlled FFI model, implying a chain of FFI nucleation points along the sample edge and their development into self-organized Josephson-like junctions (vortex rivers). In addition, our results offer insights into the applicability of widely used FFI models and suggest Nb-C to be a good candidate material for fast single-photon detectors. Comment: 12 pages, 7 pages |
| Databáze: | arXiv |
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