Ultradense Tailored Vortex Pinning Arrays in Superconducting YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−δ</sub> Thin Films Created by Focused He Ion Beam Irradiation for Fluxonics Applications

Author(s)
Bernd Aichner, Benedikt Müller, Max Karrer, Vyacheslav R. Misko, Fabienne Limberger, Kristijan Luka Mletschnig, Meirzhan Dosmailov, Johannes D. Pedarnig, Franco Nori, Reinhold Kleiner, Dieter Koelle, Wolfgang Lang
Abstract

Magnetic fields penetrate a type II superconductor as magnetic flux quanta, called vortices. In a clean superconductor they arrange in a hexagonal lattice, while by addition of periodic artificial pinning centers many other arrangements can be realized. Using the focused beam of a helium ion microscope, we have fabricated periodic patterns of dense pinning centers with spacings as small as 70 nm in thin films of the cuprate superconductor YBa2Cu3O7−δ. In these ultradense kagomé-like patterns, the voids lead to magnetic caging of vortices, resulting in unconventional commensurability effects that manifest themselves as peaks in the critical current and minima in the resistance versus applied magnetic field up to ∼0.4 T. The various vortex patterns at different magnetic fields are analyzed by molecular dynamics simulations of vortex motion, and the magnetic field dependence of the critical current is confirmed. These findings open the way for a controlled manipulation of vortices in cuprate superconductors by artificial sub-100 nm pinning landscapes.

Organisation(s)
Electronic Properties of Materials
External organisation(s)
Eberhard Karls Universität Tübingen, University of Antwerp, Johannes Kepler Universität Linz, University of Michigan, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama, Japan, Vrije Universiteit Brussel
Journal
ACS Applied Nano Materials
Volume
2
Pages
5108-5115
No. of pages
8
ISSN
2574-0970
DOI
https://doi.org/10.1021/acsanm.9b01006
Publication date
07-2019
Peer reviewed
Yes
Austrian Fields of Science 2012
Superconductivity, Nanotechnology, Ion physics
Keywords
ASJC Scopus subject areas
,
Portal url
https://ucris.univie.ac.at/portal/en/publications/ultradense-tailored-vortex-pinning-arrays-in-superconducting-yba2cu3o7-thin-films-created-by-focused-he-ion-beam-irradiation-for-fluxonics-applications(4b1d8c5b-043b-4cc4-bd86-7abed58a6392).html