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Science 31 March 1989:
Vol. 243. no. 4899, pp. 1703 - 1705
DOI: 10.1126/science.243.4899.1703
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Articles

Science, Vol 243, Issue 4899, 1703-1705
Copyright © 1989 by American Association for the Advancement of Science

articles

Hexagonal Domain-Like Charge Density Wave Phase of TaS2 Determined by Scanning Tunneling Microscopy

XIAN LIANG WU, and CHARLES H LIEBER

Department of Chemistry, Columbia University, New York, NY 10027.

The structure of the room-temperature charge density wave (CDW) phase in octahedrally coordinated tantalum disulfide, 1T-TaS2, has been a controversial issue for over 15 years. Large-scale scanning tunneling microscope images of the intralayer structure of this phase exhibit a domain-like pattern defined by a variation in the maximum CDW amplitude. The circular domains, consisting of high-amplitude CDWs, are arranged in a regular hexagonal lattice (period 73±3 angstroms) that is rotated relative to the CDWs. In addition, from the analysis of atomic resolution images it was determined that there isa well-defined phase shift between the CDWs in adjacent domains, and that within a domain the CDW superlattice is commensurate with the atomic lattice. These results provide evidence for the hexagonal discommensurate CDW phase in 1T-TaS2 and also suggest an explanation for the long-standing controversy concerning the structure of this phase.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Surface and Bulk Charge Density Wave Structure in 1 T-TaS2.
B. Burk, R. E. Thomson, J. Clarke, and A. Zettl (1992)
Science 257, 362-364
   Abstract »    PDF »
Structural and Electronic Role of Lead in (PbBi)2Sr2CaCu2O8 Superconductors by STM.
X. L. Wu, Z. Zhang, Y. L. Wang, and C. M. Lieber (1990)
Science 248, 1211-1214
   Abstract »    PDF »


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