Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: Electronic Structure of Surfaces: Spectroscopy, Surface States

O 46.15: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1A

New insights into the LaB6 (001)-surface obtained by Scanning Tunneling Microscopy — •Philipp Buchsteiner1, Martin Wenderoth1, and Geetha Balakrishnan21IV. Physikalisches Institut, Georg-August Universität Göttingen, Germany — 2Department of Physics, University of Warwick, United Kingdom

Lanthanum Hexaboride (LaB6) has attracted much attention due to its surface properties, such as an unusually low work function [1]. However, up to now only few investigations of the (001)-surface of single crystalline LaB6 using Scanning Tunneling Microscopy (STM) have been performed [2]. Our STM findings of that surface have led to striking differences for the surface structure: firstly, we have not observed any vacancies at the surface, which we relate to our different sample preparation by cleavage. Secondly, we have observed a long range height modulation within atomically resolved constant current topographies. We are hypothizing that the modulation is caused by single interstitial and vacant boron atoms within the hexaboride lattice. Such imperfections are probably generated during crystal growth, since the B/La ratio deviates slightly in the bulk material for most crystals from 6.00 [3]. [1] M. Trenary, Sci. Technol. Adv. Mater. 13 (2012), [2] J.S. Ozcomert, M. Trenary, Surf. Sci., 265 (1992), [3] T. Tanaka, S. Otani, Prog. Cryst. Growth Charact. Mater. 16 (1988)

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