Quasiperiodic potassium adlayer on decagonal Al–Ni–Co quasicrystal

Kumar Singh, Vipin; Krajčí, Marian; Bhakuni, Pramod; Canfield, P C; Roy Barman, Sudipta

doi:10.1088/1361-648X/adfe4b

Quasiperiodic potassium adlayer on decagonal Al–Ni–Co quasicrystal

Journal Article · Fri Sep 05 00:00:00 EDT 2025 · Journal of Physics: Condensed Matter

DOI:https://doi.org/10.1088/1361-648X/adfe4b· OSTI ID:2586729

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UGC-DAE Consortium for Scientific Research, Madhya Pradesh (India)
Slovak Academy of Sciences, Bratislava (Slovakia)
Ames Lab., and Iowa State Univ., Ames, IA (United States)

Quasiperiodicity in free-electron-like metals is a subject of significant interest within the scientific community. In this work, utilizing scanning tunneling microscopy (STM), low energy electron diffraction (LEED), and density functional theory (DFT), we demonstrate the formation of a quasiperiodic potassium monolayer on the tenfold surface of decagonal Al–Ni–Co quasicrystal. A dispersed growth comprising of isolated K adatoms is observed at sub-monolayer coverage, which coalesce with increasing coverage and forms pentagonal and decagonal quasiperiodic motifs. LEED demonstrates distinct rings of spots displaying decagonal symmetry. Furthermore, our DFT calculation using the W-approximant surface that closely resembles d-Al–Ni–Co shows that sizable adsorbate-substrate interaction makes the potassium adatoms bind to the quasiperiodically dispersed favorable adsorption sites resulting in the formation of quasiperiodic potassium monolayer. Notably, the experimental motifs obtained from STM measurements align remarkably well with the DFT predictions, underscoring the intricate relationship between the electronic structure of the substrate that drives the quasiperiodic growth of the potassium adlayer.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: U.S. Department of Energy, Office of Basic Energy Science; Slovak Grant Agency; Council of Scientific and Industrial Research

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2586729

Journal Information:: Journal of Physics: Condensed Matter, Journal Name: Journal of Physics: Condensed Matter Journal Issue: 36 Vol. 37; ISSN 0953-8984; ISSN 1361-648X

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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density functional theory
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