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| Home > Publications database > Electronic structure of decagonal Al-Ni-Co quasicrystal studied by photoelectron spectroscopy and density functional theory |
| Journal Article | PUBDB-2025-02174 |
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2025
Inst.
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/PhysRevB.111.165126 doi:10.3204/PUBDB-2025-02174
Abstract: The stability of the decagonal quasicrystal 𝑑-Al-Ni-Co that exhibits two-dimensional quasiperiodicity is unresolved to date. Here, employing photoelectron spectroscopy performed with hard x-rays and density functional theory (DFT), we demonstrate existence of the pseudogap in the bulk electronic structure, which is associated with strong Al-transition metal bonding. However, the pseudogap in 𝑑-Al-Ni-Co is shallower compared to other icosahedral quasicrystals, which explains the lower resistivity of the former. The 𝑊-Al-Ni-Co approximant used to perform the DFT calculation represents 𝑑-Al-Ni-Co well, as demonstrated by the existence of a calculated pseudogap and good agreement with the overall shape of the experimental valence band. The surface electronic structure of 𝑑-Al-Ni-Co studied using surface-sensitive ultraviolet photoemission spectroscopy and slab model of the 𝑊-Al-Ni-Co approximant also show satisfactory agreement and indicate that the pseudogap is suppressed at the surface.
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