Surface electronic structure of NiMnSb(001)

Correa, Juliet; Eibl, Ch.; Rangelov, G.; Braun, Jürgen; Donath, M.

doi:10.1103/physrevb.73.125316

Cited by 25 publications

(28 citation statements)

References 21 publications

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“…Values of spin polarization were reported between 40% in spin-resolved photoemission measurements 8 up to 58 ± 2.3% by superconducting point contact measurements at low temperatures 2 (see also Refs. 9,10). The discrepancy between theoretical calculations 1 and the above mentioned experimental facts were attributed to surface and interface effects.…”

Section: Introductionmentioning

confidence: 87%

Half-metallicity in NiMnSb: A variational cluster approach withab initioparameters

et al. 2010

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Electron correlation effects in the half-metallic ferromagnet NiMnSb are investigated within a combined density functional and many-body approach. Starting from a realistic multi-orbital Hubbardmodel including Mn and Ni-d orbitals, the many-body problem is addressed via the Variational Cluster Approach. The density of states obtained in the calculation shows a strong spectral weight transfer towards the Fermi level in the occupied conducting majority spin channel with respect to the uncorrelated case, as well as states with vanishing quasiparticle weight in the minority spin gap. Although the two features produce competing effects, the overall outcome is a strong reduction of the spin polarisation at the Fermi level with respect to the uncorrelated case. This result emphasizes the importance of correlation in this material.

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Section: Introductionmentioning

confidence: 87%

Half-metallicity in NiMnSb: A variational cluster approach withab initioparameters

et al. 2010

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“…This attraction remains in spite of the growing recognition that true half-metallic character may not be possible at fi nite temperatures [1,2] due to magnons [1][2][3][4][5] as well as zero-temperature interactions [6,7]. Experimental data on band structure are available for very few nominally half-metallic systems, such as NiMnSb [8]. These studies have been largely limited by experimental diffi culties in preparing a surface suitable for photoemission [1,2].…”

Section: Introductionmentioning

confidence: 99%

The electronic band structure of CoS₂

Wu¹,

Losovyj²,

Wisbey³

et al. 2007

J. Phys.: Condens. Matter

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Manno, M.; Wang, L.; Leighton, C.; and Dowben, Peter A., "The electronic band structure of CoS 2 " (2007 AbstractAngle-resolved and energy-dependent photoemission was used to study the band structure of paramagnetic CoS 2 from high-quality single-crystal samples. A strongly dispersing hybridized Co-S band is identifi ed along the Γ-X line. Fermi level crossings are also analyzed along this line, and the results are interpreted using band structure calculations. The Fermi level crossings are very sensitive to the separation in the S-S dimer, and it is suggested that the half-metallic gap in CoS 2 may be controlled by the bondingantibonding splitting in this dimer, rather than by exchange splitting on the Co atoms.

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“…Our Mn XAS spectra are characteristic of a Mn d 5 ini- It is now clear that NiMnSb(100) does have surface states. Theoretically, these surface states are spin minority, and cross the Fermi level away from Γ - [9,38,[42][43][44][45][46]105].…”

Section: Characterization Of the Surface Electronic Structurementioning

confidence: 99%

“…Indeed there is now experimental confi rmation of at least some surface states at the surface of NiMnSb(100) [105]. …”

Section: Characterization Of the Surface Electronic Structurementioning

confidence: 99%

Epitaxial Growth and Surface Properties of Half‐Metal NiMnSb Films

et al. 2007

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Pierre, J.; Ranno, L.; Nozieres, J. P.; and Dowben, Peter A., "Epitaxial growth and surface properties of half-metal NiMnSb films" (2007 AbstractWe present, herein, an extended study of the half-Heusler alloy NiMnSb, starting with the deposition technique, continuing with the basic structural and magnetic properties of the thin fi lms, and fi nishing with the electronic and compositional properties of their surfaces. The experimental methods we apply combine magnetization and magnetoresistivity measurements, atomic force microscopy, ferromagnetic resonance, x-ray and neutron diffraction, low energy electron diffraction, angle resolved x-ray photoemission, extended x-ray absorption fi ne structure spectroscopy, soft x-ray magnetic circular dichroism and spin polarized inverse photoemission spectroscopy. We fi nd that stoichiometric surfaces exhibit close to 100% spin polarization at the centre of the surface Brillouin zone at the Fermi edge at ambient temperatures. There is strong evidence for a moment reordering transition at around 80 K which marks the crossover from a high polarization state (T < 80 K) to a more representative metallic ferromagnetic state (T > 80 K). The results from the different experimental techniques are successively reviewed, with special emphasis on the interplay between composition and electronic structure of the NiMnSb fi lm surfaces. Surface segregation, consistent with a difference in free enthalpy between the surface and the bulk, is induced by annealing treatments. This surface segregation greatly reduces the surface polarization.

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Surface electronic structure of NiMnSb(001)

Cited by 25 publications

References 21 publications

Half-metallicity in NiMnSb: A variational cluster approach withab initioparameters

Half-metallicity in NiMnSb: A variational cluster approach withab initioparameters

The electronic band structure of CoS₂

Epitaxial Growth and Surface Properties of Half‐Metal NiMnSb Films

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Surface electronic structure of NiMnSb(001)

Cited by 25 publications

References 21 publications

Half-metallicity in NiMnSb: A variational cluster approach withab initioparameters

Half-metallicity in NiMnSb: A variational cluster approach withab initioparameters

The electronic band structure of CoS2

Epitaxial Growth and Surface Properties of Half‐Metal NiMnSb Films

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About

The electronic band structure of CoS₂