Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 11: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies II

O 11.7: Vortrag

Montag, 18. März 2024, 16:45–17:00, MA 004

Spin-flip excitations in organometallic chains — •Jung-Ching Liu¹, Chao Li¹, Outhmane Chahib¹, Xing Wang², Ping Zhou², Robert Häner², Silvio Decurtins², Ulrich Aschauer³, Shi-Xia Liu², Ernst Meyer¹, and Rémy Pawlak¹ — ¹Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel — ²Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern — ³Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Strasse 2A, A-5020 Salzburg

Controlling the spin of metal adatoms in well-ordered organometallic (OM) frameworks is a key step towards the realization of molecular electronics and spintronics. Here, we present the study of magnetic signatures at metal centers in the complex structure coordinated by PTO and Fe adatoms[1]. STM and AFM with CO-terminated tips[2] reveal the structure of the OM chains. STS at 1K indicates three spin-flip excitations and collective spin-state excitations of Fe on Ag(111). On Pb(111), PTO-Fe chains only show two spin-flip excitations outside the superconducting gap. By comparing these two systems, we conclude that the spin characteristics of the PTO-Fe chain do not change drastically between these substrates, while spin-state excitation is expected to have a longer lifetime on superconductors[3,4]. We believe our study provides a route for fundamental studies in spin-spin and spin-substrate interactions with different lattice structures.[1]Chem. Eur. J., 2016, 22, 8105-8112. [2]PRL, 2011, 107, 086101. [3]Nat. Phys., 2013, 9, 765-768. [4]Nano Lett. 2022, 22, 6075-6082.

Keywords: Scanning probe microscopy; Magnetism; Superconductivity; On-surface reaction