The surface phase diagram of Li/Cu(001) explored by helium atom scattering

Huang, C., MacLaren, D.A. , Bacon, R.T. and Allison, W. (2011) The surface phase diagram of Li/Cu(001) explored by helium atom scattering. Journal of Physics: Condensed Matter, 23(35), p. 355001. (doi: 10.1088/0953-8984/23/35/355001)

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We use helium atom scattering to investigate the structures formed by Li adsorption onto Cu(001) in the 0–2 ML regime. Submonolayer growth at 180 K proceeds through a sequence of ordered overlayers, including a c(2 × 2) structure at 0.5 ML and a series of 'ladder' superlattices around 0.6 ML. Beyond 1 ML, incommensurate, three-dimensional Li islands develop. A quantum close-coupled scattering analysis is performed to study the empirical He–surface potential of the structurally heterogeneous ladder structures. Good agreement with the measured distribution of diffracted intensity is obtained by describing the He–ladder interaction potential as the summation of only six one-dimensional Fourier components. The fitted potential indicates a remarkably flat surface that is punctuated by substantial, striped protrusions in the electron density. The result is consistent with the formation of one-dimensional Li wires, indicating an inhomogeneous metallization process.

Item Type:Articles
Glasgow Author(s) Enlighten ID:MacLaren, Dr Donald
Authors: Huang, C., MacLaren, D.A., Bacon, R.T., and Allison, W.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Physics: Condensed Matter
ISSN (Online):1361-648X

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