Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.9: Poster
Montag, 17. März 2025, 15:00–18:00, P4
YBa2Cu3O7 thin films on Si substrates for SQUID-on-lever scanning probe microscopy — •Simon Koch, Alexander Koller, Christoph Schmid, Reinhold Kleiner, and Dieter Koelle — Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Universität Tübingen, Germany
Scanning SQUID microscopy (SSM) is a powerful technique for imaging magnetic fields or dissipation processes. The use of the high-Tc cuprate superconductor YBa2Cu3O7 (YBCO) combined with custom made Si atomic force microscopy (AFM) cantilevers could enable SSM in the Tesla range and at temperatures up to ∼ 80 K with high spatial resolution. However, YBCO has a complex crystal structure and a small coherence length, which leads to a high sensitivity to defects on the atomic scale. High quality YBCO films can only be obtained by epitaxial growth on lattice-matched substrates. Therefore, the challenge with this approch is the integration of YBCO thin films on Si wafers. In recent years, epitaxial SrTiO3 (STO) with perovskite crystal structure has been realized on Silicon [1] and epitaxial STO-on-Si commercial substrates are now available. STO is lattice-matched to YBCO, and therefore provides an ideal starting point for the project.
We present our process for the fabrication of YBCO thin films on STO-on-Si substrates, based on pulsed laser deposition (PLD) and discuss the optimization of growth conditions. We further present our preliminary results regarding film quality and electrical characterization of fabricated structures.
[1] Abel et al., Nature Mater. 18, 42-47 (2019).
Keywords: YBCO; thin film; STO on Si; YBCO on Si; SQUID-on-lever