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O: Fachverband Oberflächenphysik
O 17: Spins on surfaces at the atomic scale – Poster
O 17.11: Poster
Montag, 9. März 2026, 18:00–20:00, P2
Investigations of FePc molecular spins on a superconducting substrate — •Luise Renz1, Máté Stark1, Jonas Arnold1, Johannes Schwenk1, Christoph Sürgers1, Wolfgang Wernsdorfer1, and Philip Willke1,2 — 1Physikalisches Institut (PHI), Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Center for Integrated Quantum Science and Technology (IQST), Karlsruhe Institute of Technology, Karlsruhe, Germany
Electron spin resonance (ESR) measurements performed with a scanning tunneling microscope (STM) has emerged as an excellent technique to probe quantum spin systems at the nanoscale. However, the spin lifetimes of surface spins are limited by scattering with substrate electrons[1]. This can be prevented by employing thin insulating layers[1]. Alternatively, superconducting substrates can be used for decoupling[2].
Here, we present results on FePc molecules on a superconducting substrate. First, we characterize the FePc molecules on the new substrate by investigating the Zeeman splitting and the molecular orbitals. Our findings show that FePc resembles a spin-1/2 system, and that the molecular orbitals exhibit a similar pattern as was previously reported on MgO/Ag(001)[3]. Additionally, we perform all electric pump-probe measurements on single FePc molecules. By adjusting the external magnetic field, we can switch between the normal conducting and superconducting state and investigate the influence of the superconductor on the T1 time of the FePc molecules.
[1] Nat. Phys. 13, 403 (2017) [2] Nat. Phys. 9, 765 (2013) [3] Nat Commun 16, 5208 (2025)
Keywords: molecular spins; spin relaxation; superconductors