Freiburg 2019 – wissenschaftliches Programm
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FM: Fall Meeting
FM 63: Poster: Enabling Technologies: Quantum Materials, Quantum Dots, Quantum Wires, Point Contacts and Superconducting Systems
FM 63.11: Poster
Mittwoch, 25. September 2019, 16:30–18:30, Tents
Josephson junctions and SQUIDs created by focused helium-ion-beam irradiation of YBa2Cu3O7 — •Max Karrer1, Benedikt Müller1, Fabienne Limberger1, Theodor Luibrand1, Zeynep Kaczmarek1, Maximilian Becker1,2, Birgit Schröppel2, Claus Burkhardt2, Reinhold Kleiner1, Edward Goldobin1, and Dieter Koelle1 — 1Physikalisches Institut and Center for Quantum Science (CQ) in LISA+, Universität Tübingen, Germany — 2NMI Natural and Medical Sciences Institute at the University of Tübingen, Reutlingen, Germany
For epitaxially grown thin films of the high-Tc cuprate superconductor YBa2Cu3O7 (YBCO), He focused ion beam (He-FIB) irradiation can be used to directly write Josephson junction (JJ) barriers into the material by driving locally the material into the insulating state [1]. In addition, He-FIB irradiation can also be used to pattern YBCO films on the nanoscale, without removing material [2]; this provides an alternative way to define insulating areas, e.g. for nanoSQUID fabrication. Here, we present our recent progress in the fabrication of He-FIB-induced YBCO JJs and SQUIDs as well as the analysis of their electric transport and noise properties, in particular with respect to the possible control of the critical current density of the JJs by variation of the He-FIB dose [3]. This approach may be also applied to the realization of YBCO-based quantum devices.
[1] S. Cybart et al., Nature Nanotechnol. 10, 598–602 (2015).
[2] E. Y. Cho et al., Appl. Phys. Lett. 113, 022604 (2018).
[3] B. Müller et al., Phys. Rev. Applied 11, 044082 (2019).