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Non-Fermi-liquid behavior in transport through Co-doped Au chains.

S Di Napoli¹, A Weichselbaum, P Roura-Bas

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.

Physical Review Letters

|May 28, 2013

Summary

We studied conductance in gold chains with a cobalt impurity, finding Kondo-like behavior at low temperatures. Stretching the chain reveals a quantum critical point in a new phase.

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Area of Science:

Condensed Matter Physics
Quantum Mechanics
Materials Science

Background:

Understanding electron transport in nanoscale magnetic systems is crucial for spintronics.
Magnetic impurities in atomic chains exhibit complex quantum phenomena.

Purpose of the Study:

To investigate the low-temperature conductance of monatomic gold chains with a single cobalt (Co) magnetic impurity.
To explore the transition from Kondo physics to other quantum phases by altering chain length.

Main Methods:

Ab initio calculations to inform an effective model.
Construction of an effective Hamiltonian (Ĥ(eff)) describing Co 3d electron hybridization with Au 5d electrons.
Numerical Renormalization Group (NRG) to solve the effective model and calculate conductance G(T).

Main Results:

Observed conductance G(T) = a - b√[T] at low temperatures, characteristic of the two-channel Kondo model.
Calculated ground state impurity entropy as ln(2)/2, confirming Kondo model similarity.
Identified a transition to a non-Kondo phase and the physics of the underscreened Kondo model at a quantum critical point upon chain stretching.

Conclusions:

Monatomic gold chains with cobalt impurities exhibit two-channel Kondo physics.
Chain length is a critical parameter controlling the transition between Kondo and non-Kondo phases.
The study provides insights into quantum criticality in mesoscopic magnetic systems.