Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 26: Complex Oxides: Surfaces and Interfaces (joint session TT/HL/MA)
TT 26.1: Talk
Tuesday, March 17, 2020, 14:00–14:15, HSZ 02
Ultradense tailored vortex pinning arrays in YBa2Cu3O7−δ thin films created by He ion beam irradiation — •Max Karrer1, Bernd Aichner2, Benedikt Müller1, Vyacheslav Misko3, Kristijan L. Mletschnig2, Meirzhan Dosmailov4, Johannes D. Pedarnig4, Franco Nori3, Reinhold Kleiner1, Wolfgang Lang2, and Dieter Koelle1 — 1Physikalisches Institut and Center for Quantum Science (CQ) in LISA+, Universität Tübingen, Germany — 2Faculty of Physics, University of Vienna, Austria — 3Theoretical Quantum Physics Group, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama, Japan — 4Institute of Applied Physics, Johannes Kepler University Linz, Austria
Magnetic fields penetrate a type II superconductor as magnetic vortices. In a clean superconductor they arrange in a hexagonal lattice; by addition of artificial pinning sites many other arrangements are possible. With a focused He ion beam, we fabricate periodic patterns of pinning sites with spacings down to 70 nm in YBa2Cu3O7−δ thin films. In ultradense kagomé-like patterns, magnetic caging of vortices results in unconventional commensurability effects, yielding peaks in the critical current and minima in the resistance versus applied 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.
[1] B. Aichner et al., ACS Appl. Nano Mater. 2, 5108–5115 (2019).