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  4. Sign-inverted response of aluminum work function to tangential strain
 
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Sign-inverted response of aluminum work function to tangential strain

Publikationstyp
Journal Article
Date Issued
2013-10-16
Sprache
English
Author(s)
Michl, Anja  
Weissmüller, Jörg  
Müller, Stefan  
Institut
Werkstoffphysik und -technologie M-22  
Keramische Hochleistungswerkstoffe M-9  
TORE-URI
http://hdl.handle.net/11420/6111
Journal
Journal of physics  
Volume
25
Issue
44
Article Number
445012
Citation
Journal of Physics Condensed Matter 44 (25): 445012 (2013)
Publisher DOI
10.1088/0953-8984/25/44/445012
Scopus ID
2-s2.0-84886922102
Publisher
IOP Publ.
We have investigated the response of the work function, W, of low-index aluminum surfaces to tangential strain by using first-principles calculations based on density functional theory. This response parameter is a central quantity in electrocapillary coupling of metal electrodes relating to the performance of porous metal actuators and surface stress based sensing devices. We find that Al surfaces exhibit a positive response for all orientations considered. By contrast, previous studies reported negative-valued response parameters for clean surfaces of several transition metals. We discuss separately the response of W to different types of strain and the impact of the strain on the Fermi energy and the surface dipole. We argue that the reason for the abnormal positive sign of the Al response parameter lies in its high valence electron density. © 2013 IOP Publishing Ltd.
DDC Class
530: Physik
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