Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 16: Superconductivity: Properties and Electronic Structure II
TT 16.5: Vortrag
Dienstag, 18. März 2025, 10:30–10:45, H32
Long-term stability of irradiation-induced defects in YBa2Cu3O7−δ thin films — •Bernd Aichner1, Sandra Keppert2, Philip Rohringer1, Marius-Aurel Bodea2, Benedikt Müller3, Max Karrer3, Reinhold Kleiner3, Edward Goldobin3, Dieter Koelle3, Johannes David Pedarnig2, and Wolfgang Lang1 — 1Faculty of Physics, University of Vienna, Wien, Austria — 2Institute of Applied Physics, Johannes Kepler University Linz, Linz, Austria — 3Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, University of Tübingen, Tübingen, Germany
Helium ion irradiation is the method of choice for creating sub-100 nm structures in cuprate superconductors suitable for pinning magnetic flux quanta.
In this presentation, we address the stability of irradiation-induced defects for irradiation performed in an ion implanter as well as in a helium ion microscope. Annealing experiments allow us to extract the activation energy for the diffusion of displaced oxygen atoms back to their original sites in the material’s crystal structure. Additionally, a long-term study indicates that vortex-matching features caused by a regular array of irradiation-induced defect columns are still present after about six years of sample storage, a strong hint for the stability of the defects created by irradiation. These findings may be an important ingredient for future applications of helium ion irradiation in the production process of superconducting electronics.
Keywords: ion irradiation; YBCO; defect healing; vortex pinning; copper-oxide superconductors