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Hexagonal Domain-Like Charge Density Wave Phase of TaS2 Determined by Scanning Tunneling Microscopy
March 31 1989
March 31 1989
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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.