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MA: Fachverband Magnetismus

MA 27: Complex Oxides: Surfaces and Interfaces (jointly with DS, HL, KFM, MA, O) (joint session TT/HL/MA)

MA 27.1: Vortrag

Dienstag, 17. März 2020, 14:00–14:15, HSZ 02

Ultradense tailored vortex pinning arrays in YBa₂Cu₃O_7−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 YBa₂Cu₃O_7−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).