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Surface and Bulk Charge Density Wave Structure in 1 T-TaS2.

B Burk, R E Thomson, J Clarke

    Science (New York, N.Y.)
    |July 17, 1992
    PubMed
    Summary
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    Charge density waves (CDWs) form domains in materials. This study reveals that in 1T-TaS(2), these striped domains are three-dimensionally ordered and identical on both the crystal surface and in the bulk.

    Area of Science:

    • Condensed Matter Physics
    • Materials Science
    • Solid-State Chemistry

    Background:

    • Incommensurate charge density waves (CDWs) can form domains where they become commensurate.
    • The geometrical structure of these domains and their surface-bulk identity have been debated.
    • Triclinic tantalum disulfide (1T-TaS(2)) is a material exhibiting complex CDW behavior.

    Purpose of the Study:

    • To accurately determine the CDW domain structure in both the surface and bulk of 1T-TaS(2).
    • To resolve controversies regarding the geometrical arrangement of CDW domains.
    • To investigate the relationship between surface and bulk CDW domain structures.

    Main Methods:

    • X-ray diffraction was used to analyze bulk CDW wave vectors and satellite peaks.

    Related Experiment Videos

  • Scanning tunneling microscopy (STM) provided high-resolution surface imaging.
  • Fourier transforms of STM images were compared with X-ray diffraction data.

    • Main Results:

    • The bulk of 1T-TaS(2) contains three-dimensionally ordered striped domains, previously misidentified.
    • The striped domain configuration observed in the bulk extends unaltered to the crystal surface.
    • Fourier analysis confirmed identical satellite positions between bulk (X-ray) and surface (STM) data.

    Conclusions:

    • The CDW domain structure in 1T-TaS(2) is characterized by three-dimensionally ordered striped domains.
    • The domain structure is identical in the crystal bulk and on the crystal surface.
    • This resolves long-standing questions about CDW domain geometry and surface-bulk consistency in 1T-TaS(2).