Photoemission spectroscopy for the spin-degenerate Anderson model

Frota, H.O.; Oliveira, L. N.

doi:10.1103/physrevb.33.7871

Cited by 139 publications

(137 citation statements)

References 26 publications

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“…2 and Supplementary Note 2). We use a fit formula based on the model of Ú jsághy et al 28 , but replace the Lorentzian form of the Kondo resonance by a phenomenological form of the Kondo resonance proposed by Frota et al 29,30 The final expression correctly describes Kondo features such as line shape 31 and more markedly the phase shift caused by the resonance fairly well in both experiment and many-body calculations 16,17,32,33 . By fitting the spectroscopic signal of the dimer, the half-width at half-maximum D of the Kondo resonance of 16.5 ± 1.5 and 15.0 ± 3.6 mV is extracted with a tip position at the centre and at the border, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Interplay between the Kondo effect and the Ruderman–Kittel–Kasuya–Yosida interaction

et al. 2014

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The interplay between the Ruderman-Kittel-Kasuya-Yosida interaction and the Kondo effect is expected to provide the driving force for the emergence of many phenomena in strongly correlated electron materials. Two magnetic impurities in a metal are the smallest possible system containing all these ingredients and define a bottom-up approach towards a longterm understanding of concentrated/dense systems. Here we report on the experimental and theoretical investigation of iron dimers buried below a Cu(100) surface by means of lowtemperature scanning tunnelling spectroscopy combined with density functional theory and numerical renormalization group calculations. The Kondo effect, in particular the width of the Abrikosov-Suhl resonance, is strongly altered or even suppressed due to magnetic coupling between the impurities. It oscillates as a function of dimer separation revealing that it is related to indirect exchange interactions mediated by the conduction electrons.

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Section: Resultsmentioning

confidence: 99%

“…We calculated the spectral functions directly without using the self-energy. Please note that the many-body calculations can be described by a phenomenological form of the Kondo resonance proposed by Frota et al 29,30 ; Supplementary Fig. 2.…”

Section: Methodsmentioning

confidence: 99%

Interplay between the Kondo effect and the Ruderman–Kittel–Kasuya–Yosida interaction

et al. 2014

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“…For example, the NRG method is able to resolve, both in static and dynamic properties, the exponentially small Kondo scale for large values of U (which can be seen neither in quantum Monte-Carlo nor in exact diagonalization). One can also study in detail the scaling spectrum of the quasiparticle peak [18,19] and the temperature dependence of transport properties [20,21] of the SIAM.…”

Section: Introductionmentioning

confidence: 99%

Finite-temperature numerical renormalization group study of the Mott transition

2001

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Wilson's numerical renormalization group (NRG) method for the calculation of dynamic properties of impurity models is generalized to investigate the effective impurity model of the dynamical mean field theory at finite temperatures. We calculate the spectral function and self-energy for the Hubbard model on a Bethe lattice with infinite coordination number directly on the real frequency axis and investigate the phase diagram for the Mott-Hubbard metal-insulator transition. While for T < Tc ≈ 0.02W (W : bandwidth) we find hysteresis with first-order transitions both at Uc1 (defining the insulator to metal transition) and at Uc2 (defining the metal to insulator transition), at T > Tc there is a smooth crossover from metallic-like to insulating-like solutions.71.10. Fd, 71.30.+h

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“…We must also include in the thermal averages the feature that the interactions give a spread in energy. Our result is (33) A detailed derivation of these equations is given in refs.…”

Section: N Kmentioning

confidence: 99%

Rare Earth Thermoelectrics

Mahan

1997

MRS Proc.

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We review the thermoelectric properties of metallic compounds which contain rare-earth atoms. They are the group of metals with the largest value ever reported of the Seebeck Coefficient. An increase by 50% of the Seebeck would make these compounds useful for thermoelectric devices. The largest Seebeck coefficient is found for compounds of cerium (e.g., CePd3) and ytterbium (e.g., YbA13). Theoretical predictions are in agreement with the maximum observed Seebeck. We discuss the theoretical model which has been used to calculate the Seebeck Coefficient. We are solving this model for other configurations (4f)n of rare-earth ground states. IntroductionThere is a need to find new materials suitable for thermoelectric applications[ 1-51. Present materials are good at room temperature and above. New materials at high temperature are always useful for power generation devices. There is also a need for new materials at low temperatures for refrigeration. They would be used in cooling for superconducting magnets and electronics. Generally, a good thermoelectric material must have high values of the electrical conductivity and Seebeck coefficient, while

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Photoemission spectroscopy for the spin-degenerate Anderson model

Cited by 139 publications

References 26 publications

Interplay between the Kondo effect and the Ruderman–Kittel–Kasuya–Yosida interaction

Interplay between the Kondo effect and the Ruderman–Kittel–Kasuya–Yosida interaction

Finite-temperature numerical renormalization group study of the Mott transition

Rare Earth Thermoelectrics

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