Journal
PHYSICAL REVIEW B
Volume 79, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.134206
Keywords
adsorbed layers; aluminium alloys; density functional theory; electron diffraction; Fermi level; manganese alloys; monolayers; palladium alloys; photoelectron spectra
Funding
- Max Planck Institute, Germany, Department of Science and Technology, India
- Ramanna Research Grant
- U.S. Department of Energy Basic Energy Sciences
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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.
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