SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 107: Poster Session VIII: Poster to Mini-Symposium: Manipulation and control of spins on functional surfaces IV
O 107.4: Poster
Donnerstag, 4. März 2021, 13:30–15:30, P
Spin dependent transmission of nickelocene-Cu contacts probed with shot noise — Michael Mohr1, Ricarda Reuter1, Manuel Gruber1, David Jacob2, Paula Abufager3, Nicolás Lorente4, •Alexander Weismann1, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — 2Departamento de Física de Materiales, Universidad del País Vasco UPV/EHU, E-20018 San Sebastián, Spain — 3Instituto de Física de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Rosario, 2000 Rosario, Argentina — 4Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), E-20018 Donostia-Sebastián, Spain
The current I through nickelocene molecules and its noise are measured with a low-temperature scanning tunneling microscope on Cu(100). DFT and many-body calculations are used to analyze the data. During contact formation, two types of current evolution are observed, namely an abrupt jump to contact and a smooth transition. These data along with dI/dV spectra are interpreted in terms of a transition from a spin-1 to a spin-1/2 state that is Kondo-screened. Many-body calculations show that the smooth transition is also consistent with a renormalization of spin excitations of a spin-1 molecule by Kondo exchange coupling. The shot noise is significantly reduced compared to the Schottky value of 2eI. The noise can be described in the Landauer picture in terms of the spin polarization of the transmission of ≈35 % through two degenerate dπ-orbitals of the nickelocene molecule.