Conductance Switching and Vibrational Fine Structure of a [2-2] CoII 4 Gridlike Single Molecule Measured in a Three-Terminal Device

摘要

For the deposition of a molecule in the junction we used ahome-made liquid cell, placed inside a 4He cryostat, containing a 0.1mM molecule solution. At room temperature, electromigration was performed in a liquid environment on about 16 junctions that were rinsed with the pure solvent, dried, and cleaned in an oxygen plasma beforehand. Nanoconstrictions with a resistance in the kV range were first prepared in the solution containing the molecules. The electromigrated junctions were then left in the molecule solution for about half an hour to allow for ‘‘self- breaking’’ [26] of the constricted gold wire. Junctions that did not self-break within this time were then deliberately broken at conductances higher than G0. Lastly, the sample space was evacuated and the cooling procedure to 1.7 K began. In total, 100 junctions were measured.