Scanning tunneling microscopy of atoms and charge-density waves in 1 T -TaS sub 2 , 1 T -TaSe sub 2 , and 1 T -VSe sub 2

Journal Article · Tue May 15 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.10082· OSTI ID:6880180

Giambattista, B; Slough, C G; McNairy, W W; Coleman, R V ^[1]

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1. Department of Physics, University of Virginia, Charlottesville, VA (USA)

The surface atomic structure and the charge-density-wave (CDW) structure in the 1{ital T} phase of TaSe{sub 2}, TaS{sub 2}, and VSe{sub 2} have been studied at 4.2, 77, and 300 K. The response of the scanning tunneling microscope (STM) to the CDW superlattice in 1{ital T}-TaSe{sub 2} and 1{ital T}-TaS{sub 2} is extremely strong, while in 1{ital T}-VSe{sub 2} the CDW generates a much weaker response. In 1{ital T}-TaSe{sub 2} and 1{ital T}-TaS{sub 2} at 4.2 and 77 K the STM scans show a {radical}13 {bold a}{sub 0}{times} {radical}13 {bold a}{sub 0} pattern characteristic of a triple-{bold q} commensurate CDW structure. The atomic lattice and CDW superlattice are simultaneously resolved, but the atomic modulation represents a small fraction of the total STM deflection leading to a substantial variation in the atomic resolution. At 300 K we continue to observe a commensurate {radical}13 {bold a}{sub 0}{times} {radical}13 {bold a}{sub 0} CDW pattern in 1{ital T}-TaSe{sub 2} while 1{ital T}-TaS{sub 2} shows a modulated two-dimensional structure due to the incommensurate CDW wavelength characteristic of the nearly commensurate phase.

• DOE Contract Number: FG05-84ER45072
• OSTI ID: 6880180
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 41:14; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TANTALUM SELENIDES
ELECTRONIC STRUCTURE
TANTALUM SULFIDES
VANADIUM SELENIDES
CRYSTAL STRUCTURE
ELECTRON DIFFRACTION
FERMI LEVEL
LOW TEMPERATURE
MEDIUM TEMPERATURE
SCANNING ELECTRON MICROSCOPY
SUPERLATTICES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE
VACANCIES
WORK FUNCTIONS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL DEFECTS
DIFFRACTION
ELECTRON MICROSCOPY
ENERGY LEVELS
FUNCTIONS
MICROSCOPY
POINT DEFECTS
REFRACTORY METAL COMPOUNDS
SCATTERING
SELENIDES
SELENIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
360603* - Materials- Properties