Local charge-density-wave structure in 1T-TaS2 determined by scanning tunneling microscopy

R. E. Thomson, U. Walter, E. Ganz, J. Clarke, A. Zettl, P. Rauch, F. J. Disalvo

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Abstract

We have imaged simultaneously the lattice and the charge-density-wave (CDW) superstructure in 1T-TaS2 over the temperature range 370 77 K. In the nearly commensurate (NC) phase between 353 and 183 K we find that the CDW occurs not in commensurate domains but with a uniform, incommensurate orientation throughout the crystal surface. Local measurements of the relative angle between the CDW and the underlying atomic lattice failed to find any areas where the local angle was the commensurate angle, in contradiction to the hexagonal-domain NC-phase model of Nakanishi and Shiba. In the nearly commensurate triclinic (T) phase between 223 and 283 K produced when the temperature is increased, we have directly observed CDW discommensurations in agreement with the stretched honeycomb discommensurate T-phase model of Nakanishi and Shiba.

Original languageEnglish (US)
Pages (from-to)10734-10743
Number of pages10
JournalPhysical Review B
Volume38
Issue number15
DOIs
StatePublished - Jan 1 1988

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