Abstract
Atom scattering is becoming recognized as a sensitive probe of the electron-phonon interaction parameter λ at metal and metal-overlayer surfaces. Here, the theory is developed, linking λ to the thermal attenuation of atom scattering spectra (in particular, the Debye-Waller factor), to conducting materials of different dimensions, from quasi-1D systems such as W(110):H(1 × 1) and Bi(114), to quasi-2D layered chalcogenides, and high-dimensional surfaces such as quasicrystalline 2ML-Ba(0001)/Cu(001) and d-AlNiCo(00001). Values of λ obtained using He atoms compare favorably with known values for the bulk materials. The corresponding analysis indicates in addition, the number of layers contributing to the electron-phonon interaction, which is measured in an atom surface collision.
Highlights
The corresponding analysis indicates in addition, the number of layers contributing to the electron–phonon interaction, which is measured in an atom surface collision
In this work we focus on the specific role of dimensionality in the e–ph mass-enhancement factor as derived from Helium atom scattering (HAS).[3]
Analysis of the data for thermal attenuation of the specular He atom diffraction peak for up to ten layers of the alkali metals Li, Na, K, Rb, and Cs deposited on various metal substrates produced values for λHAS that are in quite reasonable agreement with known tabulated values for bulk crystals, and for up to 25 ML of Pb deposited on Cu(111).[10]
Summary
2W(kf, ki, T) is that it is rigorously proportional to the temperature, subject to the condition that T is large compared to the. The case of multiple Pb monolayers is of particular interest because thin films of Pb on Si and GaAs are known to remain superconductors down to one monolayer.[7,12,13,14,15] An interesting first observation of the thermal attenuation of specular He atom scattering for layer-by-layer growth is that, for a given system, the slope of the DW plots increased linearly with λHAS π 2n α;α. Analysis of the data for thermal attenuation of the specular He atom diffraction peak for up to ten layers of the alkali metals Li, Na, K, Rb, and Cs deposited on various metal substrates produced values for λHAS that are in quite reasonable agreement with known tabulated values for bulk crystals, and for up to 25 ML of Pb deposited on Cu(111).[10]. We show below that with appropriate interpretation of Equations (2) and (3) reliable values of λHAS can be extracted from such experimental data
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