Journal Article

FZJ-2025-03653

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Induced superconductivity in hybrid Au/YBa2Cu3O7−x electrodes on vicinal substrates

Gundareva, I. (First author)FZJ* ; Martinez-Castro, J.FZJ* ; Tautz, F. S.FZJ* ; Mussler, G.FZJ* ; Jalil, A. R.FZJ* ; Hou, X.FZJ* ; Grützmacher, D.FZJ* ; Schäpers, T.FZJ* ; Lyatti, M. (Corresponding author)FZJ*

2025
Springer Nature [London]

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Please use a persistent id in citations: doi:10.1038/s41598-025-17434-y  doi:10.34734/FZJ-2025-03653

Abstract: Superconducting electrodes are an integral part of hybrid Josephson junctions used in many applications including quantum technologies. We report on the fabrication and characterization of superconducting hybrid Au/YBa2Cu3O7−x (YBCO) electrodes on vicinal substrates. In these structures, superconducting CuO2-planes face the gold film, resulting in a higher value and smaller variation of the induced energy gap compared to conventional Au/YBCO electrodes based on films with the c-axis normal to the substrate surface. Using scanning tunneling microscopy, we observe an energy gap of about 10–17 meV at the surface of the 15- nm-thick gold layer deposited in situ atop the YBCO film. To study the origin of this gap, we fabricate nanoconstrictions from the Au/YBCO heterostructures and measure their electrical transport characteristics. The conductance of the nanoconstrictions shows a series of dips due to multiple Andreev reflections in YBCO and gold, providing clear evidence of the superconducting nature of the gap in gold. We consider the Au/YBCO electrodes to be a versatile platform for hybrid Josephson devices with a high operating temperature.

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Contributing Institute(s):

1. Quantum Nanoscience (PGI-3)
2. Elektronische Eigenschaften (PGI-6)
3. Halbleiter-Nanoelektronik (PGI-9)
4. JARA Institut Green IT (PGI-10)

Research Program(s):

1. 5213 - Quantum Nanoscience (POF4-521) (POF4-521)

Appears in the scientific report 2025

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