Success and failure of the Friedel-Anderson resonance model for magnetic impurities: 3<i>d</i>impurities on the surface of Au

Beckmann, H.; Bergmann, Gerd

doi:10.1103/physrevb.54.368

Cited by 20 publications

(19 citation statements)

References 14 publications

(18 reference statements)

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“…In summary, we have shown by means of XMCD that the magnetic moments of Ni adatom impurities on the surfaces of Au(111) and Ag(100) are quenched in agreement with earlier experimental observations [18]. Upon coordination to TCNQ the Ni atoms recover their magnetic moments and show ferromagnetic coupling.…”

supporting

confidence: 90%

“…The corresponding XMCD spectra, defined as I À À I þ , are shown at the bottom of the panels. The nearly vanishing XMCD of the Ni impurities demonstrates that their magnetic moment is quenched on both surfaces, in line with previous reports [18,19], but in contradiction with a theoretical prediction [22]. Hence, we conclude that Ni adatoms hybridize strongly with the substrate and are spin-quenched due to strong correlation effects [35].…”

supporting

confidence: 77%

“…Achieving this goal is similarly challenging since the adsorption on a metal surface can significantly modify the chemical and electronic state of both organic and inorganic components. Particularly, the magnetic moments of the metal centers can be considerably reduced or even quenched due to screening by surface electrons [18][19][20][21][22]. Also, the chemisorbed organic ligands can undergo appreciable electron transfer and associated bond order changes [23,24].…”

mentioning

confidence: 99%

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Superexchange-Mediated Ferromagnetic Coupling in Two-Dimensional Ni-TCNQ Networks on Metal Surfaces

et al. 2013

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We investigate the magnetic coupling of Ni centers embedded in two-dimensional metal-coordination networks self-assembled from 7,7,8,8-tetracyanoquinodimethane (TCNQ) molecules on Ag(100) and Au(111) surfaces. X-ray magnetic circular dichroism measurements show that single Ni adatom impurities assume a spin-quenched configuration on both surfaces, while Ni atoms coordinating to TCNQ ligands recover their magnetic moment and exhibit ferromagnetic coupling. The valence state and the ferromagnetic coupling strength of the Ni coordination centers depend crucially on the underlying substrate due to the different charge state of the TCNQ ligands on the two surfaces. The results suggest a superexchange coupling mechanism via the TCNQ ligands.

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supporting

confidence: 90%

supporting

confidence: 77%

mentioning

confidence: 99%

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Superexchange-Mediated Ferromagnetic Coupling in Two-Dimensional Ni-TCNQ Networks on Metal Surfaces

et al. 2013

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“…AL analysis cannot provide independent quantification of the inelastic-scattering limiting and of magnetic spin-flip scattering. [34][35][36][37] In the absence of independent knowledge allowing a quantification of magnetic spin-flip scattering, this mechanism is presumed negligible. For isotropic SO scattering in perpendicular H the correction to the resistivity is then 15,17,32 …”

Section: Resultsmentioning

confidence: 99%

Spin and phase coherence measured by antilocalization inn-InSbthin films

Kallaher

Heremans

2009

Phys. Rev. B

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The spin and phase coherence times of the itinerant electrons in n-InSb thin films were experimentally determined by analyzing the low-temperature magnetoresistance in antilocalization theory. The results indicate a very weak temperature dependence below 10 K for the spin coherence time. The dependence of the spin coherence time on carrier density demonstrates that the Elliott-Yafet mechanism is predominantly responsible for electron-spin relaxation in n-type InSb at low temperatures. The phase coherence time follows an inverse temperature dependence, in accordance with the electron-electron Nyquist dephasing mechanism.

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“…where [39][40][41][42] and thus τ i = τ φ 19 . The phase and spin coherence lengths are defined respectively as L φ = Dτ φ and L so = √ Dτ so .…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit interaction and phase coherence in lithographically defined bismuth wires

Rudolph

Heremans

2011

Phys. Rev. B

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We present low temperature magnetoresistance measurements on lithographically defined bismuth wires. The phase coherence time and the spin-orbit scattering time are obtained by analysis of weak-antilocalization, with values for the phase coherence time supported by analysis of the universal conductance fluctuations present in the wires. We find that the phase coherence time is dominated by electron-phonon scattering above ≈ 2 K and saturates below that temperature, with saturation delayed to a lower temperature in wider wires. The spin-orbit scattering time shows a weak temperature dependence above 2 K, and also shows a dependence on wire width. The spinorbit scattering time increases as the width is reduced, as also observed in wires fabricated from spin-orbit coupled two-dimensional systems in semiconductor heterostructures. The similarity is discussed in the light of weak-antilocalization in the two-dimensional strongly spin-orbit coupled Bi(001) surface states.

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Success and failure of the Friedel-Anderson resonance model for magnetic impurities: 3dimpurities on the surface of Au

Cited by 20 publications

References 14 publications

Superexchange-Mediated Ferromagnetic Coupling in Two-Dimensional Ni-TCNQ Networks on Metal Surfaces

Superexchange-Mediated Ferromagnetic Coupling in Two-Dimensional Ni-TCNQ Networks on Metal Surfaces

Spin and phase coherence measured by antilocalization inn-InSbthin films

Spin-orbit interaction and phase coherence in lithographically defined bismuth wires

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