SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 57: Poster: Superconductivity I
TT 57.23: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG2
Investigation and optimization of YBa2Cu3O7−δ Josephson junctions written with a focused He ion beam — •Christoph Schmid1, Max Karrer1, Katja Wurster1, Moritz Meichsner1, Isabelle Vandermoeten1, Noor Hasan1, Ramón Manzorro2,3, Javier Pablo-Navarro2,3, Cesar Magen2,3, Dieter Koelle1, Reinhold Kleiner1, and Edward Goldobin1 — 1Physikalisches Institut, Center for Quantum Science and LISA+, Universität Tübingen, Germany — 2Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Spain — 3Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, Spain
We use a focused He Ion Beam (He-FIB) to “write” Josephson barriers across YBa2Cu3O7−δ (YBCO) thin-film bridges.
Such Josephson junctions (JJs) exhibit RCSJ-like I–V characteristics, and the dependence of critical current vs. magnetic field resembles a Fraunhofer pattern [1].
Scanning transmission electron microscopy (STEM) shows that He-FIB irradiation modifies locally (∼ 10 nm) the YBCO crystal structure that can partially heal with time.
Electric transport measurements provide the evolution of the JJ parameters with time or thermal annealing.
Those reveal barrier recovery processes and show how to stabilize the JJ parameters on short time scales.
Furthermore, we investigated the interaction of two and more JJs placed close to each other and biased in series.
Using a multi-terminal arrangement we found some unexpected behavior that will be discussed.
Several approaches to synchronize arrays of He-FIB written JJs are investigated.
[1] B. Müller et al., Phys. Rev. Applied 11, 044082 (2019)