•Joachim Reichert1, Heiko B. Weber1, Marcel Mayor1
und Hilbert von Löhneysen2
1Forschungszentrum Karlsruhe, Institut für Nanotechnologie, Postfach 3640, D-76021 Karlsruhe
2Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe and Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe
We present an experimental protocol which allows to perform conductance
spectroscopy on single organic molecules at low temperatures (T »
30K) . The conductance data obtained at low-T with a conjugated sample
molecule show a highly improved data quality with a higher stability, narrower
linewidth and substantially reduced noise compared to room-temperature
(RT) data . For the RT measurements a rather broad range of sample-to-sample
fluctuations was attributed to different microscopic contact realisations.
The smaller number of variations in the recorded low-T spectra might indicate
that here energetically favourable configurations occure more frequently.
Thus the comparability of experimental data with other experiments as well
as with theoretical simulations is considerably improved.