Issue |
Europhys. Lett.
Volume 54, Number 5, June 2001
|
|
---|---|---|
Page(s) | 626 - 632 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2001-00338-1 | |
Published online | 01 December 2003 |
Large modulation-amplitude, local barrier-height, scanning tunneling microscopy
Department of Physics, The Pennsylvania State
University University Park, PA 16802, USA
Received:
4
December
2000
Accepted:
23
March
2001
We compare and contrast both STM topographic images and local
tunneling barrier-height (LBH) spatial distributions using
relatively large modulation of the tunneling gap. Measurements
were carried out on various surfaces including
-
,
-
-
,
-
-
. The
experimental results of the local barrier-height obtained in this
way are dependent on the tip-sample distance indicative of strong
tip-sample interaction. The large modulation LBH method senses
the "hardness"of the tip surface interaction potential, which
varies with lattice position. Both methods, STM topographic
images and local barrier-height images, provide complementary,
but different information, to check the consistency of structural
conclusions.
PACS: 68.37.Ef – Scanning tunneling microscopy (including chemistry induced with STM) / 68.35.Bs – Structure of clean surfaces (reconstruction) / 81.05.-t – Specific materials; fabrication, treatment, testing and analysis
© EDP Sciences, 2001
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