Scaling of the low temperature dephasing rate in Kondo systems

Abstract

We present phase coherence time measurements in quasi-one-dimensional Ag wires doped with Fe Kondo impurities of different concentrations $n_s$. Due to the relatively high Kondo temperature $T_K\approx 4.3K$ of this system, we are able to explore a temperature range from above $T_K$ down to below $0.01T_K$. We show that the magnetic contribution to the dephasing rate ${\gamma }_m$ per impurity is described by a single, universal curve when plotted as a function of $(T/T_K)$. For $T>0.1T_K$, the dephasing rate is remarkably well described by recent numerical results for spin $S=1/2$ impurities. At lower temperature, we observe deviations from this theory. Based on a comparison with theoretical calculations for $S>1/2$, we discuss possible explanations for the observed deviations.

arXiv comment4 pages, 3 figures, submitted to Phys. Rev. Lett

References in corpus (13)

• Transport Coefficients of the Anderson Model via the Numerical Renormalization Group
• Intrinsic Decoherence in Mesoscopic Systems
• Kondo effect in a magnetic field and the magnetoresistivity of Kondo alloys
• Dephasing of Electrons in Mesoscopic Metal Wires
• Dephasing in Metals by Two-Level Systems in the 2-Channel-Kondo Regime
• Dephasing by extremely dilute magnetic impurities revealed by Aharonov-Bohm oscillations
• Singular Dynamics of Underscreened Magnetic Impurity Models
• Theory of inelastic scattering from magnetic impurities
• Universal dephasing rate due to diluted Kondo impurities
• Anomalous temperature dependence of the dephasing time in mesoscopic Kondo wires
• Electron transport and energy relaxation in dilute magnetic alloys
• Experimental Test of the Numerical Renormalization Group Theory for Inelastic Scattering from Magnetic Impurities
• Phase coherence of conduction electrons below the Kondo temperature

Cited by in corpus (32)

• The numerical renormalization group method for quantum impurity systems
• Mechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect
• Electrical manipulation of spin states in a single electrostatically gated transition-metal complex
• A Josephson phase battery
• Observation of the underscreened Kondo effect in a molecular transistor
• Kondo decoherence: finding the right spin model for iron impurities in gold and silver
• Theory of inelastic scattering from quantum impurities
• Quantum Coherence at Low Temperatures in Mesoscopic Systems: Effect of Disorder
• Phase coherence of conduction electrons below the Kondo temperature
• Disorder-quenched Kondo effect in mesosocopic electronic systems
• Nonperturbative Scaling Theory of Free Magnetic Moment Phases in Disordered Metals
• Local susceptibility and Kondo scaling in the presence of finite bandwidth
• Electron coherence at low temperatures: The role of magnetic impurities
• Quantum decoherence of interacting electrons in arrays of quantum dots and diffusive conductors
• Magnetic Field Dependence of Dephasing Rate due to Diluted Kondo Impurities
• Effect of Disorder on the Quantum Coherence in Mesoscopic Wires
• Observation of strong electron dephasing in disordered Cu${}_{93}$Ge${}_4$Au${}_3$ thin films
• Iron impurities in gold and silver: Comparison of transport measurements to numerical renormalization group calculations exploiting non-Abelian symmetries
• Kondo Quantum Dots and the Novel Kondo-doublet interaction
• Equilibrium Fermi-liquid coefficients for the fully screened N-channel Kondo model
• Inelastic Scattering from Local Vibrational Modes
• Inelastic decay from integrability
• Electronic excitation spectra of the five-orbital Anderson impurity model: From the atomic limit to itinerant atomic magnetism
• Phase-Coherent Dynamics of Quantum Devices With Local Interactions
• Magnetic dephasing in mesoscopic spin glasses
• Low-temperature electron dephasing time in AuPd revisited
• Low temperature dephasing in irradiated metallic wires
• The Realization of Artificial Kondo Lattices in Nanostructured Arrays
• Weak localization, Aharonov-Bohm oscillations and decoherence in arrays of quantum dots
• Non-Markovian dephasing of disordered, quasi-one-dimensional fermion systems
• Remanence effects in the electrical resistivity of spin glasses
• Inelastic scattering from quantum impurities