Ordering at the surface of Cu sub 85 Pd sub 15 (110)

We have investigated ordering at the (110) surface of Cu sub 85 Pd sub 15 using scanning tunnelling microscopy (STM) and reflectance anisotropy spectroscopy (RAS). The surface is found to adopt the L1 sub 2 structure of Cu sub 3 Pd, with double atomic height steps and the exclusive existence of a te...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 1997-10, Vol.30 (20), p.2783-2787
Main Authors: Lewis, D, Thornton, J M C, Power, J R, Weightman, P
Format: Article
Language:English
Online Access:Get full text
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Summary:We have investigated ordering at the (110) surface of Cu sub 85 Pd sub 15 using scanning tunnelling microscopy (STM) and reflectance anisotropy spectroscopy (RAS). The surface is found to adopt the L1 sub 2 structure of Cu sub 3 Pd, with double atomic height steps and the exclusive existence of a termination by rows of atoms believed to be Cu. These rows are revealed to be imperfectly ordered on a scale to which previous diffraction experiments would have been insensitive. RAS revealed the presence of a feature at about 2 eV similar to that observed on the surface of pure Cu(110), which we attribute to the rows of Cu atoms on the Cu sub 85 Pd sub 15 (110) surface. The intensity of the RAS feature was lower than that found for the Cu(110) surface, though it developed with annealing, implying that it may be used to monitor the disorder in the Cu rows observed by STM.
ISSN:0022-3727