Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.6: Poster
Monday, March 17, 2025, 15:00–18:00, P4
Nanoscale Characterization of Defects in Superconducting Nitrides — •Janine Lorenz1,2,3, Amin Karimi1, Yorgo Hadad1, Rami Barends1, F. Stefan Tautz1,2,3, and Felix Lüpke1,4 — 1Peter Grünberg Institut, Forschungszentrum Jülich, Germany — 2Jülich Aachen Research Alliance (JARA) - Fundamentals of Future Information Technology, Germany — 3Institut für Experimentalphysik IV A, RWTH Aachen Universität, Germany — 4II. Physikalisches Institut, Universität zu Köln, Germany
Due to their elevated critical temperature and high kinetic inductance, Nitride supercondcutors are promising candidates for microwave resonators and low-noise amplifiers that are essential for useful quantum computing. We aim to improve structural and superconducting properties of our 11 nm NbTiN thin films grown by sputter deposition. By implementing a post-deposition thermal annealing protocol in Nitrogen/Hydrogen gas atmosphere we achieve an increase in critical temperature from initially 11.5 K to 18 K. In this work, we apply scanning probe techniques to investigate surface superconductivity and defects that appear as Yu-Shiba-Rusinov states of treated and untreated thin films.
Keywords: Scanning Tunneling Microscopy; Scanning Tunneling Spectroscopy; NbTiN; Superconductivity; Microwave Resonators