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, 196402 – Published 6 May 2013

Abstract

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 H^eff 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 H^eff with the numerical renormalization group we find that at low temperatures G(T)=abT 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.

  • Received 12 October 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.196402

© 2013 American Physical Society

Authors & Affiliations

S. Di Napoli1, A. Weichselbaum2, P. Roura-Bas1, A. A. Aligia3, Y. Mokrousov4, and S. Blügel4

  • 1Departamento de Física de la Materia Condensada, CAC-CNEA, Avenida General Paz 1499, 1650 San Martín, Provincia de Buenos Aires, Argentina and Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, Buenos Aires C1033AAJ, Argentina
  • 2Ludwig Maximilians University and Arnold Sommerfeld Center for Theoretical Physics, 80333 Munich, Germany
  • 3Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, 8400 Bariloche, Argentina
  • 4Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

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Issue

Vol. 110, Iss. 19 — 10 May 2013

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