Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 45: Poster Spins on Surfaces at the Atomic Scale
O 45.11: Poster
Tuesday, March 18, 2025, 18:00–20:00, P2
Atomic-scale Josephson spectroscopy performed over magnetic clusters on Pb(111) — •Bharti Mahendru1, Martina Trahms1,2, Katharina Biel1, Werner M. J. van Weerdenburg1, Clemens B. Winkelmann2, and Katharina J. Franke1 — 1Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Université Grenoble Alpes, CNRS, Institut Neél, 25 Avenue des Martyrs, 38042 Grenoble, France
When two superconducting leads are brought in close proximity, they form a Josephson junction (JJ). In a JJ, quantum tunnelling of Cooper pairs occurs without an applied voltage between the two superconductors with a phase difference. To study the properties of Cooper-pair tunneling at the atomic scale, a scanning tunneling microscope is a powerful tool. A JJ forms by approaching the tip to the sample. Previously, it has been shown that a Josephson junction including a single magnetic adatom shows non-reciprocity in the retrapping current [1]. This expression of the Josephson-diode effect was ascribed to the broken particle-hole symmetry induced by the Yu-Shiba-Rusinov (YSR) states inside the superconducting energy gap. Here, we investigate the effect of hybridized YSR states of self-assembled Fe clusters on Pb(111). We find non-reciprocal retrapping currents that we correlate with the asymmetry in the YSR states and their spatial distribution. [1] Martina Trahms et al., Nature 615, (2023)
Keywords: Superconductivity; Josephson spectroscopy; Yu-Shiba-Rusinov (YSR) states; Josephson junctions; magnetic clusters