Temperature dependence of electric-field gradients at isolated Se adatoms on (001) and (111) surfaces and derived adatom distances - art. no. 081404

Authors
Weber, A Potzger, K Granzer, H Bertschat, HH Zeitz, WD Dietrich, M Lindgren, B
Citation
A. Weber et al., Temperature dependence of electric-field gradients at isolated Se adatoms on (001) and (111) surfaces and derived adatom distances - art. no. 081404, PHYS REV B, 6408(8), 2001, pp. 1404
Citations number
24
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6408
Issue
8
Year of publication
2001
Database
ISI
SICI code
0163-1829(20010815)6408:8<1404:TDOEGA>2.0.ZU;2-3
Abstract
Increasing electric-field gradients (EFG) with increasing temperature were observed at isolated Se adatoms on Ni(111), Pd(111), and Co(0001) surfaces applying perturbed angular correlation spectroscopy. This is in contrast to EFG's at probes on surfaces with (001) orientation and in metallic bulk sy stems. We correlate the results with the EFG dependence on the adatom dista nce from the surface, as calculated by the discrete variational method mole cular/cluster method. The sign changes from negative EFG's on (001), to pos itive EFG's on (111) surfaces. The distance of isolated Se atoms will be co mpared with measurements of concentrated Se coverage.