Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity: Topological Defects in Superconductors and Magnets (joint session TT/MA)

TT 22.7: Vortrag

Montag, 12. März 2018, 16:45–17:00, HFT-FT 101

Giant non-local vortex motion in WC nanowires grown by Ga+ focused ion beam deposition — •Rosa Córdoba^1,2, José María De Teresa^1,2,3, Ricardo Ibarra^2,3, Isabel Guillamón⁴, Hermann Suderow⁴, Sebastián Vieira⁴, and Javier Sesé^2,3 — ¹Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-UZ, Spain — ²Departamento de Física de la Materia Condensada, Universidad de Zaragoza, Spain — ³Laboratorio de Microscopías Avanzadas, Instituto de Nanociencia de Aragón, UZ — ⁴Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Spain

In this contribution, we propose an unconventional route to transfer vortices as single particles through long distances (in the micrometers range), within WC nanowires (50 nm in width), taking profit of current-induced non-local vortex motion [1]. By reducing the lateral dimensions of wires near superconducting coherence length of the material, we measured a giant non-local electrical signal which is 40 times higher than those reported for wider wires of other superconductors. Comparing the non-local electrical signal in WC wires of different dimensions, we found that the signal for 50 nm-wide WC nanowires is nearly two orders of magnitude higher than for the 200 nm-wide WC ones. The measured giant non-local signal in the former strongly confirms that the vortex line is more rigid than the vortex lattice in wider wires due to its quasi-1D character and its confinement potential that prevents the transversal vortex displacements.

[1] R. Córdoba et al. manuscript submitted to Applied Physics Letters.