Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Transport: Poster Session
TT 58.29: Poster
Mittwoch, 9. März 2016, 15:00–18:30, Poster D
Conductance through a ferrocene based molecule — Karthiga Kanthsamy1, •Ejvind Olsen1, David Zsolt Manrique3, Qusiy Al Galiby3, Christoph Tegenkamp1,2, Colin Lambert3, and Herbert Pfnür1,2 — 1Institute für Festkörperphysik, Leibniz University Hannover, Hannover, Germany — 2Laboratory for Nano and Quantum Engineering, Leibniz University Hannover, Hannover, Germany — 3Department of Physics, Lancaster University, Lancaster LA 14YB, United Kingdom
We investigate the electrical transport through 1,1'-bis [4-thio acetyl phenyl] ferrocene (FBPDT) molecule using mechanically controllable break junction technique (MCBJ). The junctions were broken in vacuum. Two types of measurements were done. First, conductance were measured at constant voltage by repeated opening and closing of the junction. Step-wise change in conductance values are observed below 1G0 after molecular adsorption. The histogram shows dominant peaks at 0.017G0 and 0.002G0. Second, the IV characteristics were measured at stable conductance values below 1G0 which remain linear, but conductance decreases with increasing distance between the electrodes. The theoretical calculations based on density functional theory and non-equilibrium Green's function formalism shows that the rotation of the phenyl ring influences the transmission through the molecule. The molecule is energetically degenerate irrespective of rotation of phenyl ring angle with respect to the cyclo pentyl ring. The phenyl rings act as tunneling barriers resulting in lower conductance compared to ferrocene dithiol.