Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)
O 58.21: Poster
Mittwoch, 13. März 2013, 18:15–21:45, Poster B1
Tb on Bi thin films - Conductivity and surface diffusion — •P. Kröger1, D. Lükermann1, S. Sologub2, H. Pfnür1, M. Horn von-Hoegen3, C. Klein3, and C. Tegenkamp1 — 1Inst. f. Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover — 2Nat. Acad. of Science, Nauky Av. 46, 03028 Kyiv, Ukraine — 3Dep. of Physics and CeNIDE, Uni Duisburg-Essen, Lotharstraße 1, 47057 Duisburg
The semimetal bismuth has attracted a lot of interest because of its unique electronic properties such as a low carrier concentration and a large mobility. Furthermore, the surface states reveal a pronounced Rashba splitting and the conductivity can be well discriminated from bulk contributions if thin films are grown epitaxially on Si(111) substrates, making surface related effects accessible even in macroscopic conductance measurements. In this conclusion the adsorption of various adsorbates on Bi(111) will be discussed. Adsorption of magnetic atoms (Fe, Co and Tb) at low T is accompanied by a transition from Weak Anti- to Weak Localization in magneto-transport measurements, related to the break of time reversal symmetry. Furthermore there a significant increase of carrier concentration due to hybridization effects has been found. [1] For Tb, additionally, surface diffusion of Tb-atoms even at T≈10 K needs to be considered. Visible as a low coverage minimum in conductance during adsorption. A simple nucleation theory approach describes the data very well. Tb turns out to be an even stronger scatterer than the other magnetic atoms like Co or Fe. [1] Lükermann et. al, PRB 84 (2012), accepted.