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Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.50: Poster

Wednesday, February 27, 2008, 14:00–18:00, Poster B

Electronic transport through C60 — •Tobias Böhler, Achim Edtbauer, and Elke Scheer — Universität Konstanz FB Physik

The electronic transport through a single or a few C60 molecules is studied experimentally with the help of the mechanically controllable break-junction (MCB) technique [1,2]. The tip electrodes of the MCB are fabricated of Al. The molecule is evaporated onto an opened break-junction under UHV conditions and at low temperatures (10 K). The experiment shows evidence for excitations of Al phonons in the differential conductance. By varying the electrode position we can shift the phonon energy. From the development of the energy we find evidence for longitudinal and transversal phonon modes. With C60 between the contacts we observe additional features in the d2I/dV2 which we tentatively attribute to vibronic modes of C60 previously observed for C60 with gold contacts [2]. Furthermore the dI/dV’s of Al-C60-Al contacts reveals a Kondo behaviour with a characteristic temperature of approximately 70 K.

[1] T. Böhler et al. Nanotechnology 15 (2004) 465

[2] T.Böhler et al. PRB 76 (2007) 125432

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