ADSORPTION-INDUCED INCREASING SPECULARITY OF CONDUCTION ELECTRONS’ SURFACE SCATTERING

Sergii Sologub, Ivan Bordeniuk, Roman Amirov, Nataliia Petrova and Ivan Yakovkin
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Sergii Sologub: Department of Adsorption Phenomena, Institute of Physics of the National Academy of Sciences of Ukraine, Avenue Nauky 46, Kyiv 03028, Ukraine
Ivan Bordeniuk: Department of Adsorption Phenomena, Institute of Physics of the National Academy of Sciences of Ukraine, Avenue Nauky 46, Kyiv 03028, Ukraine
Roman Amirov: Department of Adsorption Phenomena, Institute of Physics of the National Academy of Sciences of Ukraine, Avenue Nauky 46, Kyiv 03028, Ukraine
Nataliia Petrova: Department of Adsorption Phenomena, Institute of Physics of the National Academy of Sciences of Ukraine, Avenue Nauky 46, Kyiv 03028, Ukraine
Ivan Yakovkin: #x2020;Department of Physical Electronics, Institute of Physics of the National Academy of Sciences of Ukraine, Avenue Nauky 46, Kyiv 03028, Ukraine

Surface Review and Letters (SRL), 2021, vol. 28, issue 04, 1-11

Abstract: We present a review of our investigations on the increasing specularity of surface scattering of conduction electrons on the W(011), Mo(011), and W(001) surfaces after covering the surfaces with well-ordered (sub)monolayers of adsorbed hydrogen or deuterium. The degree of the specularity of surface scattering was estimated on the base of measurements of magnetoresistance of single-crystalline plates, cooled with liquid He, under ultra-high vacuum conditions, and in a strong magnetic field. The structures of adsorbed hydrogen and deuterium layers were determined from LEED patterns. It is found that the magnetoresistance non-monotonically depends on submonolayer hydrogen coverage and degree of the ordering of adsorbed layers, showing a drastic increase of the specularity (which is higher than for the atomically-clean surfaces!) after the formation of the well-ordered (1×1)-H structures and a pronounced increase of the specularity after the formation of the well-ordered (2×2)-2H structure. Changes in the magnetoresistance induced by the ordering of structures of adsorbed H(D) layers are found to corroborate with the adsorption-induced transformation of Fermi contours of surface electronic states obtained in performed DFT calculations. The increase of the specularity of the scattering caused by the ordering of the surface structures is attributed to the decrease of the probability of electronic transitions between the surface and bulk electronic states induced by surface scattering.

Keywords: Surface scattering of conduction electrons; galvanomagnetic size phenomena; submonolayer adsorption; density functional calculations; surface electronic states; Fermi surface (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218625X2130001X

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