Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 90: Quantum Impurities and Kondo Physics
TT 90.1: Vortrag
Donnerstag, 12. März 2026, 17:00–17:15, CHE/0091
Unveiling local magnetic moments in copper-oxide atomic junctions — •Marcel Strohmeier1, Samanwita Biswas2, Wolfgang Belzig1, Regina Hoffmann-Vogel2, and Elke Scheer1 — 1Department of Physics, University of Konstanz, 78457 Konstanz, Germany — 2Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam-Golm, Germany
Incorporating oxygen into metallic atomic-scale junctions modifies the interatomic bonding and may even promote the formation of monoatomic chains [1]. In the specific case of copper oxide, first-principles studies have predicted the emergence of ferromagnetic ground states, attributing certain atomic configurations with spin-filtering capabilities [2]. By means of low-temperature transport measurements, we provide a series of experimental evidence indicating the presence of local magnetism in air-oxidized mechanically controllable copper break junctions. Our investigations on ultimately small contacts range from magnetotransport measurements [3] to the analysis of anomalous shot noise in the presence of strong zero-bias anomalies [4]. The analysis of the latter reveals signatures of spin-polarized currents, a finding that needs to be reconciled with the spectroscopic features being interpreted within a Kondo model [5].
[1] Thijssen et al., New J. Phys. 10, 033005 (2008)
[2] Zheng et al., J. Appl. Phys. 117, 043902 (2015)
[3] Strigl et al., Nat Commun 6, 6172 (2015)
[4] Tewari et al., Nano Lett. 18, 5217 (2018)
[5] Calvo et al., PRB 86, 075447 (2012)
Keywords: Kondo Effect; Atomic contact; Shot noise; Magnetotransport; Copper oxide