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Quasiperiodic layers of free-electron metals studied using electron diffraction

TitleQuasiperiodic layers of free-electron metals studied using electron diffraction
Publication TypeJournal Article
Year of Publication2009
AuthorsShukla AK, Dhaka RS, D'Souza SW, Singh S, Wu D, Lograsso TA, Krajci M, Hafner J, Horn K, Barman SR
Journal TitlePhysical Review B
Volume79
Pages134206
Date Published04/01
ISBN Number1098-0121
Accession NumberISI:000265942800056
Keywordsadsorbed layers, alloys, aluminium alloys, density functional theory, electron diffraction, fermi level, leed, manganese alloys, monolayers, palladium alloys, photoelectron spectra, range, single-crystals, steps, surface
Abstract

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.
URL<Go to ISI>://000265942800056
DOI10.1103/Physrevb.79.134206