Unoccupied spin-split surface state on Co(0 0 0 1): experiment and theory

Math, C.; Braun, Jürgen; Donath, M.

doi:10.1016/s0039-6028(01)00812-3

Cited by 23 publications

(17 citation statements)

References 27 publications

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“…15. The values of the three parameters z I , z A , and z E that finally lead to a quantitative agreement between the measured and the calculated spectra are the following: z I …”

Section: ͑9͒mentioning

confidence: 63%

“…5,6 In contrast, exchange-split surface states with both majority and minority components completely filled or empty serve as sensors of the surface magnetic properties but do not influence the net spin density responsible for the magnetic moment. [7][8][9][10] Since Ni͑111͒ and Co͑0001͒ with their hexagonal surface geometry exhibit surface-derived states close to the Fermi level, 5,[11][12][13][14][15] a similar behavior is expected for the Fe͑110͒ surface with its twofold but almost hexagonal symmetry. However, the experimental results reported for Fe͑110͒ so far are not conclusive with respect to crystal-induced surface states.…”

Section: Introductionmentioning

confidence: 61%

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Surface resonances versus surface states on Fe(110)

et al. 2002

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The spin-dependent surface electronic structure of ferromagnetic Fe͑110͒ is investigated experimentally and theoretically. Spin-resolved, inverse-photoemission results show a complex multipeak structure close to the Fermi level. Part of it is surface derived with an unexpected spin dependence and light-polarization dependence. The puzzling experimental findings are interpreted on the basis of a comprehensive theoretical analysis. Electronic slab calculations find surface-related features, caused by the crystal-vacuum interface, only well below the Fermi level. Calculations of the ͑inverse͒ photoemission intensities within the relativistic one-step model based on a bulk band structure, but with a realistic surface barrier, reveal an additional surface resonance around the Fermi level. Its nearly vanishing exchange splitting at ⌫ and abnormal energy dispersion behavior as a function of the wave vector parallel to the surface are in accordance with the experimental findings.

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“…15. The values of the three parameters z I , z A , and z E that finally lead to a quantitative agreement between the measured and the calculated spectra are the following: z I …”

Section: ͑9͒mentioning

confidence: 63%

Section: Introductionmentioning

confidence: 61%

Surface resonances versus surface states on Fe(110)

et al. 2002

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“…48,49 Therefore, in our experiments the samples were remantently magnetized in the film plane along the corresponding easy axis. For Fe(110) this is along N , for Co(0001) along M, and for Ni(111) along K, 37,[49][50][51] as indicated in Figs. 1(a), 1(e), and 1(f).…”

Section: Methodsmentioning

confidence: 99%

“…31 The discrepancy has been explained in terms of a strong nonlocality of correlation effects not taken into account in the present DMFT/3BS calculations. In the case of Co, which has been at the focus of (S)ARPES experiments since the beginning of the 1980s, 8,[32][33][34][35][36][37][38] only a few studies have been devoted to a detailed comparison between many-body calculations and experiments. 32,35,[39][40][41] Here we point out that SARPES revealed a strong spin dependence of the scattering rates at high BE (i.e., the bulklike Co majority spin bands show a much larger broadening when compared to the corresponding bulklike minority bands for binding energies larger than ∼1 eV).…”

Section: Introductionmentioning

confidence: 99%

Effects of spin-dependent quasiparticle renormalization in Fe, Co, and Ni photoemission spectra:An experimental and theoretical study

Sánchez-Barriga

Braun²,

Minář³

et al. 2012

Phys. Rev. B

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We have investigated the spin-dependent quasiparticle lifetimes and the strength of electron correlation effects in the ferromagnetic 3d transition metals Fe, Co, and Ni by means of spin-and angle-resolved photoemission spectroscopy. The experimental data are accompanied by state-of-the-art many-body calculations within the dynamical mean-field theory and the three-body scattering approximation, including fully relativistic calculations of the photoemission process within the one-step model. Our quantitative analysis reveals that inclusion of local many-body Coulomb interactions are of ultimate importance for a realistic description of correlation effects in ferromagnetic 3d transition metals. However, we found that more sophisticated many-body calculations with larger modifications in the case of Fe and Co are still needed to improve the quantitative agreement between experiment and theory. In general, it turned out that not only the dispersion behavior of energetic structures should be affected by nonlocal correlations but also the line widths of most of the photoemission peaks are underestimated by the current theoretical approaches. The increasing values of the on-site Coulomb interaction parameter U and the band narrowing of majority spin states obtained when moving from Fe to Ni indicate that the effect of nonlocal correlations becomes weaker with increasing atomic number, whereas correlation effects tend to be stronger.

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“…Nevertheless, the electronic properties of Co/ W͑110͒ have only been investigated by spatially averaging techniques where stacking fault effects are not detectable. [13][14][15][16][17][18][19] Apart from the question of the influence of stacking, there are also contradictory results concerning the surface-related states of Co(0001) itself. Early angle resolved photoelectron spectroscopy (ARUPS) measurements claimed an sp-like surface state at −0.3 eV with respect to the Fermi energy, 20,21 which was later ascribed to a d 3z 2 −r 2-like state.…”

Section: Introductionmentioning

confidence: 99%

Scanning tunneling spectroscopy on Co(0001): Spectroscopic signature of stacking faults and dislocation lines

et al. 2004

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The growth morphology and electronic structure of Co(0001) grown on W(110) are studied using scanning tunneling microscopy and scanning tunneling spectroscopy (STS) at T = 6 K. Depending on growth conditions, continuous Co films or Co islands on top of a wetting layer are formed. Within the continuous films, dislocation lines appear and increase in density after annealing. Co islands and films exhibit dI / dV curves with a pronounced peak at −0.3 eV below the Fermi energy. The intensity of this peak is changing in different areas of the surface. Using monolayer high islands with a different shape deposited on the same Co layer we attribute the different intensity to a different stacking of the Co surface. The change in intensity is reproduced by first-principles electronic structure calculations, which reveal that the peak is caused by a d 3z 2 −r 2-like surface resonance of a minority-spin character more strongly coupled to the bulk states in the case of hcp (ABA) stacking than in the case of fcc (ABC) stacking. An increased STS intensity of the surface resonance was also found above dislocation lines located at the Co/W interface. 70 035404-1 FIG. 9. The calculated vacuum DOS of the unfaulted structure (black) and of the faulted structure (gray) of a 12 ML Co film at a distance of 3 Å from the surface layer. Maj, min, and maj + min indicate the majority DOS, the minority DOS, and the sum of both, respectively. All curves are shown on the same scale.

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Unoccupied spin-split surface state on Co(0 0 0 1): experiment and theory

Cited by 23 publications

References 27 publications

Surface resonances versus surface states on Fe(110)

Surface resonances versus surface states on Fe(110)

Effects of spin-dependent quasiparticle renormalization in Fe, Co, and Ni photoemission spectra:An experimental and theoretical study

Scanning tunneling spectroscopy on Co(0001): Spectroscopic signature of stacking faults and dislocation lines

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