Surface structure and analysis with scanning tunneling microscopy and electron tunneling spectroscopy
During the current grant period we have continued to develop the spectroscopic applications of the Scanning Tunneling Microscopy and have carried out a large number of measurements on the gap structure due to charge-density waves and superconductivity. The measured energy gaps in 2H-TaSe{sub 2}, 2H-TaS{sub 2} and 2H-NbSe{sub 2} are {Delta} = 80, 50, and 34 mV giving values of 2{Delta}/k{sub B}T{sub c} of 15.2, 15.4 and 21.9. Measured energy gaps in 1T-TaSe{sub 2} and 1T- TaS{sub 2} are {Delta} {approx equal} 150 mV with 2{Delta}/k{sub B}T{sub c} {approx equal} 5.8. In the linear chain compounds, initial measurements have determined {Delta} = 30 mV in NbSe{sub 3} and {Delta} = 120 mV in orthorhombic TaS{sub 3}.
- Research Organization:
- Virginia Univ., Charlottesville, VA (USA). Dept. of Physics
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG05-84ER45072
- OSTI ID:
- 5216448
- Report Number(s):
- DOE/ER/45072-35; ON: DE90005604
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
CHARGE DENSITY
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
ENERGY GAP
MICROSCOPY
PHYSICAL PROPERTIES
PROGRESS REPORT
REFRACTORY METAL COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SULFIDES
SULFUR COMPOUNDS
SUPERCONDUCTIVITY
SURFACE PROPERTIES
SURFACES
TANTALUM COMPOUNDS
TANTALUM SULFIDES
TRANSITION ELEMENT COMPOUNDS