Weak localization in spin-glass systems

Wei, Wei; Bergmann, Gerd; Peters, Ralf-Peter

doi:10.1103/physrevb.38.11751

Cited by 17 publications

(15 citation statements)

References 17 publications

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“…(29) [here T K is the Kondo temperature for a single magnetic impurity, n s is the concentration of these impurities, and energy T sg is defined in Eq. (10)].…”

Section: Discussionmentioning

confidence: 99%

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Electron transport and energy relaxation in dilute magnetic alloys

2003

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We consider the effect of the RKKY interaction between magnetic impurities on the electron relaxation rates in a normal metal. The interplay between the RKKY interaction and the Kondo effect may result in a non-monotonic temperature dependence of the electron momentum relaxation rate, which determines the Drude conductivity. The electron phase relaxation rate, which determines the magnitude of the weak localization correction to the resistivity, is also a non-monotonic function of temperature. For this function, we find the dependence of the position of its maximum on the concentration of magnetic impurities. We also relate the electron energy relaxation rate to the excitation spectrum of the system of magnetic impurities. The energy relaxation determines the distribution function for the out-of-equilibrium electrons. Measurement of the electron distribution function thus may provide information about the excitations in the spin glass phase.

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“…(29) [here T K is the Kondo temperature for a single magnetic impurity, n s is the concentration of these impurities, and energy T sg is defined in Eq. (10)].…”

Section: Discussionmentioning

confidence: 99%

“…The dependence ∆σ wl vs. T has a minimum at temperature T * defined in Eq. (29). This minimum results from the competition between two opposite trends: with the reduction of temperature, τ s gets shorter, see Eq.…”

Section: Phase Relaxation Ratementioning

confidence: 93%

Electron transport and energy relaxation in dilute magnetic alloys

2003

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“…Spin-glasses can occur with the axes of the moments distributed isotropically (Heisenberg spin-glass), or aligned parallel or antiparallel (Ising spin-glass). Under the present case of strong spin-orbit scattering (τ −1 SO τ −1 i ) however, both spin-glasses are predicted to lead to the same reduction in τ −1 s by S/(S + 1) compared to the free-spin case 24,26 . For Sm 3+ and Gd 3+ Fig.…”

mentioning

confidence: 97%

“…One may expect paramagnetic behavior to be maintained on a substrate, since the 4f shells are partially shielded by the outermost s and p shells and crystal field effects will hence be small. However, the magnetic moments of the RE ions may still be locked to specific orientations by interaction with the substrate atoms, or by Rudermann-Kittel-KasuyaYosida (RKKY) interactions 3,24,25 , leading to spin-glass behavior. Both a paramagnetic system or a spin-glass lead to spin-flip scattering.…”

mentioning

confidence: 99%

Measurement by antilocalization of interactions between InAs surface electrons and magnetic surface species

Zhang¹,

Kallaher²,

Soghomonian³

et al. 2013

Phys. Rev. B

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“…They form a classical random spin array whose spin scattering rate is smaller than that for free quantum spins by the factor 1/3, and scale linearly with n m . 55 At intermediate concentrations of magnetic impurities Griffiths-McCoy singularities can appear and induce an interesting though more complex behavior (see Ref. 56 for a review).…”

Section: Dependence Of P (Tk) On the Concentration Of Magnetic Imentioning

confidence: 99%

Disorder-quenched Kondo effect in mesoscopic electronic systems

Kettemann

Mucciolo

2007

Phys. Rev. B

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Nonmagnetic disorder is shown to quench the screening of magnetic moments in metals, the Kondo effect. The probability that a magnetic moment remains free down to zero temperature is found to increase with disorder strength. Experimental consequences for disordered metals are studied. In particular, it is shown that the presence of magnetic impurities with a small Kondo temperature enhances the electron's dephasing rate at low temperatures in comparison to the clean metal case. It is furthermore proven that the width of the distribution of Kondo temperatures remains finite in the thermodynamic (infinite volume) limit due to wave function correlations within an energy interval of order 1/τ , where τ is the elastic scattering time. When time-reversal symmetry is broken either by applying a magnetic field or by increasing the concentration of magnetic impurities, the distribution of Kondo temperatures becomes narrower.

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Weak localization in spin-glass systems

Cited by 17 publications

References 17 publications

Electron transport and energy relaxation in dilute magnetic alloys

Electron transport and energy relaxation in dilute magnetic alloys

Measurement by antilocalization of interactions between InAs surface electrons and magnetic surface species

Disorder-quenched Kondo effect in mesoscopic electronic systems

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