Surface structure and spectroscopy of charge-density wave materials using scanning tunneling microscopy
The Scanning tunneling microscope (STM) has been used to study the effects of Fe doping on the charge-density wave (CDW) structure in NbSe{sub 3} and 1T-TaS{sub 2}. In NbSe{sub 3} small amounts of Fe reduce both CDW gaps by 25--30% and change the relative CDW amplitudes of the high and low temperature CDWs. The CDW amplitudes remain strong on all three chains of the surface unit cell with no evident disorder. In 1T-Fe{sub 0.05}Ta{sub 0.95}S{sub 2} the Fe introduces substantial disorder in the CDW pattern, but the local CDW amplitude remains strong. The CDW energy gap is reduced by approximately 50% and the resistive anomaly at the commensurate-incommensurate transition is removed. The STM in both the image and spectroscopy modes can detect subtle changes in CDW structure due to impurities.
- Research Organization:
- Virginia Univ., Charlottesville, VA (United States). Dept. of Physics
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG05-84ER45072
- OSTI ID:
- 5901839
- Report Number(s):
- DOE/ER/45072-49; ON: DE92007746
- Country of Publication:
- United States
- Language:
- English
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Surface structure and spectroscopy of charge-density wave materials using scanning tunneling microscopy
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Related Subjects
36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
665100* -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
CHARGE DENSITY
CRYSTAL DOPING
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
ELEMENTS
IRON
METALS
MICROSCOPY
MICROSTRUCTURE
NIOBIUM COMPOUNDS
NIOBIUM SELENIDES
REFRACTORY METAL COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SELENIDES
SELENIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
SURFACES
TANTALUM COMPOUNDS
TANTALUM SULFIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WAVE PROPAGATION
360602 -- Other Materials-- Structure & Phase Studies
665100* -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
CHARGE DENSITY
CRYSTAL DOPING
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
ELEMENTS
IRON
METALS
MICROSCOPY
MICROSTRUCTURE
NIOBIUM COMPOUNDS
NIOBIUM SELENIDES
REFRACTORY METAL COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SELENIDES
SELENIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
SURFACES
TANTALUM COMPOUNDS
TANTALUM SULFIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WAVE PROPAGATION