Electronic structure of quasicrystalline surfaces: Effects of surface preparation and bulk structure

Fournée, V.; Pinhero, P. J.; Anderegg, James W.; Lograsso, Thomas A.; Ross, A. R.; Canfield, Paul C.; Fisher, I. R.; Thiel, Patricia A.

doi:10.1103/physrevb.62.14049

Cited by 39 publications

(38 citation statements)

References 48 publications

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“…For i-Al-Pd-Mn, the Al 2p BE turns out to be 73.1 eV, which is in good agreement with the literature. 33 The bulk ͑arrow͒ and surface ͑tick͒ plasmon related features are observed at 16 and 10.4 eV loss energies, respectively. The plasmon energies are in agreement with the electron energy loss spectroscopy data.…”

Section: Resultsmentioning

confidence: 99%

Growth and electronic structure of alkali-metal adlayers on icosahedralAl70.5Pd21Mn8.5

et al. 2006

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We report x-ray photoelectron spectroscopy ͑XPS͒ study of Na and K adlayers on icosahedral Al 70.5 Pd 21 Mn 8.5 ͑i-Al-Pd-Mn͒ quasicrystal. The Na 1s core-level exhibits a continuous linear shift of 0.8 eV towards lower binding energies ͑BE͒ with increasing coverage up to one monolayer ͑ML͒ saturation coverage. In the case of K / i-Al-Pd-Mn, a similar linear shift in the K 2p spectra towards lower BE is observed. In both cases, the plasmon related loss features are observed only above 1 ML. The substrate core-level peaks, such as Al 2p, do not exhibit any shift with the adlayer deposition up to the highest coverage. Based on these experimental observations and previous studies of alkali metal growth on metals, we conclude that below 1 ML, both Na and K form a dispersed phase on i-Al-Pd-Mn and there is hardly any charge transfer to the substrate. The variation of the adlayer and substrate core-level intensities with coverage indicates layer by layer growth.

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Section: Resultsmentioning

confidence: 99%

Growth and electronic structure of alkali-metal adlayers on icosahedralAl70.5Pd21Mn8.5

et al. 2006

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“…In any case, the existence of a deep pseudogap is an indication of a considerable degree of covalency in the interaction between the Al and the transition-metal atoms. 33 Previous investigations ͑both theoretical 30 and experimental 34 ͒ of the surface electronic structure of i-Al-Pd-Mn have demonstrated that the metallic character of the bonding is enhanced at the surface and that the pseudogap is partially leveled out as a consequence of a strong relaxation of the near-surface Al atoms. The present work extends these studies to the electronic structure of a well-ordered quasiperiodic adlayer and we find that the pseudogap has disappeared.…”

Section: Resultsmentioning

confidence: 99%

Quasiperiodic layers of free-electron metals studied using electron diffraction

et al. 2009

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Using electron diffraction, we show that free-electron metals, such as sodium and potassium, form a highly regular quasiperiodic monolayer on the fivefold surface of icosahedral Al-Pd-Mn and that the quasiperiodicity propagates up to the second layer in sodium. Our photoelectron spectroscopy results show that the quasicrystalline alkali-metal adlayer does not exhibit a pseudogap near the Fermi level thought to be characteristic for the electronic structure of quasicrystalline materials. Calculations based on density functional theory provide a model structure for the quasicrystalline alkali-metal monolayer and confirm the absence of a pseudogap. Disciplines Metallurgy CommentsThis article is from Physical Review B 79 (2009) Using electron diffraction, we show that free-electron metals, such as sodium and potassium, form a highly regular quasiperiodic monolayer on the fivefold surface of icosahedral Al-Pd-Mn and that the quasiperiodicity propagates up to the second layer in sodium. Our photoelectron spectroscopy results show that the quasicrystalline alkali-metal adlayer does not exhibit a pseudogap near the Fermi level thought to be characteristic for the electronic structure of quasicrystalline materials. Calculations based on density functional theory provide a model structure for the quasicrystalline alkali-metal monolayer and confirm the absence of a pseudogap.

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“…In particular, the sp states are strongly hybridized with the transition metal d states, leading to the formation of a strong suppression of the sp density of states at the Fermi level. Several experiments have shown that the pseudogap is maintained up to the first layers of the sputter-annealed surface [23]. The pseudogap in the partial sp DOS could thus be the origin of the electronic confinement within the metal thin films.…”

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confidence: 99%