Abstract
NiIn is one of the few intermetallics to adopt the highly unusual CoSn (B35) structure. In this paper we describe the preparation of the clean, ordered (0001) surface of stoichiometric single crystal NiIn in ultra-high vacuum, using Ar ion bombardment and annealing, with characterisation by X-ray photoelectron spectroscopy (XPS), Auger spectroscopy (AES), and low energy electron diffraction (LEED). Preferential sputtering occurs, but a stoichiometric, ordered surface can be obtained by annealing to 700±25 K. This surface appears to be a simple bulk termination, with the same lateral periodicity and composition, indicating the stability of the non-close packed indium layers in the CoSn structure.
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