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Inicio » Actividades I+D > Publicaciones 2013 > Non-Fermi-Liquid Behavior in Transport T...
artículo con referato
"Non-Fermi-Liquid Behavior in Transport Through Co-Doped Au Chains"
S. Di Napoli, A. Weichselbaum, P. Roura-Bas, A.A. Aligia, Y. Mokrousov and S. Blügel
Phys. Rev. Lett. 110(19) (2013) 196402/1-5
We calculate the conductance as a function of temperature G(T) 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 Ĥeff that hybridizes a 3d7 quadruplet at the Co site with two 3d8 triplets through the hopping of 5dxz and 5dyz electrons of Au. The quadruplet is split by spin anisotropy due to spin-orbit coupling. Solving Ĥeff with the numerical renormalization group we find that at low temperatures G(T) = a - bT and the ground state impurity entropy is ln(2)/2, 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.
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