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- Title
A tunable two-impurity Kondo system in an atomic point contact.
- Authors
Bork, Jakob; Zhang, Yong-hui; Diekhöner, Lars; Borda, László; Simon, Pascal; Kroha, Johann; Wahl, Peter; Kern, Klaus
- Abstract
Two magnetic atoms, one attached to the tip of a scanning tunnelling microscope and one adsorbed on a metal surface, each constituting a Kondo system, have been proposed as one of the simplest conceivable systems potentially exhibiting quantum critical behaviour. We have succeeded in implementing this concept experimentally for cobalt dimers clamped between a scanning tunnelling microscope tip and a gold surface. Control of the tip-sample distance with subpicometre resolution enables us to tune the interaction between the two cobalt atoms with unprecedented precision. Electronic transport measurements on this two-impurity Kondo system reveal a rich physical scenario, which is governed by a crossover from local Kondo screening to non-local singlet formation due to antiferromagnetic coupling as a function of separation of the cobalt atoms.
- Subjects
OLIGOMERS; ELECTRONIC systems; DIMERS; ELECTRON transport; COBALT
- Publication
Nature Physics, 2011, Vol 7, Issue 11, p901
- ISSN
1745-2473
- Publication type
Article
- DOI
10.1038/nphys2076