Hexagonal Domain-Like Charge Density Wave Phase of TaS 2 Determined by Scanning Tunneling Microscopy
- 31 March 1989
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 243 (4899), 1703-1705
- https://doi.org/10.1126/science.243.4899.1703
Abstract
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 is a 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 publication has 21 references indexed in Scilit:
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