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- W2068081126 abstract "We study the unoccupied region of the electronic structure of the fivefold symmetric surface of an icosahedral ($i$) Al-Pd-Mn quasicrystal. A feature that exhibits parabolic dispersion with an effective mass of ($1.15ifmmodepmelsetextpmfi{}0.1$)${mathrm{m}}_{e}$ and tracks the change in the work function is assigned to an image potential resonance because our density functional calculation shows an absence of band gap in the respective energy region. We show that Sn grows pseudomorphically on $itext{ensuremath{-}}mathrm{Al}text{ensuremath{-}}mathrm{Pd}text{ensuremath{-}}mathrm{Mn}$ as predicted by density functional theory calculations, and the energy of the image potential resonance tracks the change in the work function with Sn coverage. The image potential resonance appears much weaker in the spectrum from the related crystalline Al-Pd-Mn surface, demonstrating that its strength is related to the compatibility of the quasiperiodic wave functions in $itext{ensuremath{-}}mathrm{Al}text{ensuremath{-}}mathrm{Pd}text{ensuremath{-}}mathrm{Mn}$ with the free-electron-like image potential states. Our investigation of the energy region immediately above ${E}_{F}$ provides unambiguous evidence for the presence of a pseudogap, in agreement with our density functional theory calculations." @default.
- W2068081126 created "2016-06-24" @default.
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- W2068081126 date "2014-09-05" @default.
- W2068081126 modified "2023-09-24" @default.
- W2068081126 title "Unoccupied electronic states of icosahedral Al-Pd-Mn quasicrystals: Evidence of image potential resonance and pseudogap" @default.
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- W2068081126 doi "https://doi.org/10.1103/physrevb.90.115407" @default.
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