Detection of atomic surface structure on NbSe/sub 2/ and NbSe/sub 3/ at 77 and 4. 2 K using scanning tunneling microscopy
Journal Article
·
· J. Vac. Sci. Technol., A; (United States)
Scanning tunneling microscopy (STM) studies have been performed on NbSe/sub 2/ and NbSe/sub 3/ at 77 and 4.2 K. The surface atomic structure has been clearly resolved, but evidence of charge-density wave (CDW) modulation has only been observed at 4.2 K in NbSe/sub 3/. CDW's exist in NbSe/sub 2/ at 4.2 K and in NbSe/sub 3/ at 77 K, but the CDW amplitude is either too small or is screened by the remaining conduction electrons. The linear chain structure in NbSe/sub 3/ has been clearly resolved and the STM profiles are dominated by the heights and effective charges of the surface Se atoms. Improved sensitivity and resolution will be required to study any details of the CDW structure in both compounds.
- Research Organization:
- Department of Physics, University of Virginia, Charlottesville, Virginia 22901
- OSTI ID:
- 5443599
- Journal Information:
- J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 6:2; ISSN JVTAD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
CHALCOGENIDES
CHARGE DENSITY
ELECTRON MICROSCOPY
ELECTRONIC STRUCTURE
MICROSCOPY
NIOBIUM COMPOUNDS
NIOBIUM SELENIDES
REFRACTORY METAL COMPOUNDS
RESOLUTION
SCANNING ELECTRON MICROSCOPY
SELENIDES
SELENIUM COMPOUNDS
SENSITIVITY
SURFACES
TOPOGRAPHY
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
360602* -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
CHALCOGENIDES
CHARGE DENSITY
ELECTRON MICROSCOPY
ELECTRONIC STRUCTURE
MICROSCOPY
NIOBIUM COMPOUNDS
NIOBIUM SELENIDES
REFRACTORY METAL COMPOUNDS
RESOLUTION
SCANNING ELECTRON MICROSCOPY
SELENIDES
SELENIUM COMPOUNDS
SENSITIVITY
SURFACES
TOPOGRAPHY
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE