A Tunable Two-impurity Kondo system in an atomic point contact

Details A Tunable Two-impurity Kondo system in an atomic point contact A Tunable Two-impurity Kondo system in an atomic point contact

2011-08-03

arxiv.org/abs/1108.0869v1

Nat. Phys. 7, 901 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

22 pages, 5 figures

Scientific paper

10.1038/NPHYS2076

Two magnetic atoms, one attached to the tip of a Scanning Tunneling Microscope (STM) 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 an STM tip and a gold surface. Control of the tip-sample distance with sub-picometer resolution allows 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.

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