Ultra-fast vortex motion in a direct-write Nb-C superconductor

Autor(en)

O. V. Dobrovolskiy, D. Yu Vodolazov, F. Porrati, R. Sachser, V. M. Bevz, M. Yu Mikhailov, A. V. Chumak, M. Huth

Abstrakt

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−1 in a directly written Nb-C superconductor with a close-to-perfect edge barrier. 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.

Organisation(en)

Nanomagnetismus und Magnonik

Externe Organisation(en)

Kharkiv National University, Russian Academy of Sciences, Moscow State Pedagogical University (MSPU), Johann Wolfgang Goethe-Universität Frankfurt am Main, National Academy of Sciences of Ukraine (NASU)

Journal

Nature Communications

Band

11

Anzahl der Seiten

10

ISSN

2041-1723

DOI

https://doi.org/10.1038/s41467-020-16987-y

Publikationsdatum

07-2020

Peer-reviewed

Ja

ÖFOS 2012

103033 Supraleitung, 103017 Magnetismus

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie, Allgemeine Chemie, Allgemeine Biochemie, Genetik und Molekularbiologie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/67c2f76b-292f-4430-b81f-788e6def1abe