Abstract
We discuss the use of mechanically controllable break-junctions (MCBs) as electrodes forcontacting individual objects such as clusters or molecules. A big advantage of MCBelectrodes is the possibility of varying the contact geometry and, accordingly, thecontact resistances and the quantum coherent transport properties between theobject under study and the electrodes. We compare the suitability of single-atomcontacts of different elements as electrode material. Finally, we present preliminaryresults on electronic transport through individual (or a few) fullerene moleculescontacted by gold MCB electrodes. The typical resistances are in the order of thequantum of conductance. The circuits sustain voltages of the order of 1 V and aremechanically more stable than single-atom contacts between the gold electrodesalone.
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