Abstract
We calculate the conductance as a function of temperature through Au monatomic chains containing one Co atom as a magnetic impurity, and connected to two conducting leads with a fourfold symmetry axis. Using the information derived from ab initio calculations, we construct an effective model that hybridizes a quadruplet at the Co site with two triplets through the hopping of and electrons of Au. The quadruplet is split by spin anisotropy due to spin-orbit coupling. Solving with the numerical renormalization group we find that at low temperatures and the ground state impurity entropy is , a behavior similar to the two-channel Kondo model. Stretching the chain leads to a non-Kondo phase, with the physics of the underscreened Kondo model at the quantum critical point.
- Received 12 October 2012
DOI:https://doi.org/10.1103/PhysRevLett.110.196402
© 2013 American Physical Society