Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 30: Poster Session - Surface Magnetism
O 30.8: Poster
Montag, 16. März 2020, 18:15–20:00, P1A
Spin dependent transmission of nickelocene-copper contacts probed with shot noise — Michael Mohr1, Manuel Gruber1, Alexander Weismann1, David Jacob2, Paula Abufager3, Nicolás Lorente4, and •Richard Berndt1 — 1Christian-Albrechts-Universität zu Kiel, Kiel, Germany — 2UPV/EHU, Donostia-San Sebastián, and IKERBASQUE, Bilbao, Spain — 3CONICET and Universidad Nacional de Rosario, Rosario, Argentina — 4CFM/MPC and DIPC, Donostia-Sebastián, Spain
The current I through nickelocene molecules and its noise are measured with a low temperature STM on a Cu(100) substrate. Density functional theory calculations and many-body modeling are used to analyze the data. During contact formation, two types of current evolution are observed, an abrupt jump to contact and a smooth transition. These data along with conductance spectra (dI/dV) recorded deep in the contact range 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 but no influence of the Kondo effect or spin excitations are resolved. The noise can be described in the Landauer picture in terms of spin-polarized transmission of ≈35 % through two degenerate dπ-orbitals of the nickelocene molecule. Support via the European Union’s Horizon 2020 research and innovation programme (766726) is acknowledged.