X-ray studies of the charge-density wave transitions in TaS₂

Mark O. Robbins Cavendish Laboratory, Madingley Road, Cambridge University, Cambridge, CB3 0HE, England; Department of Physics, University of California, Berkeley, California, 94720, U.S.A.

E. A. Marseglia Cavendish Laboratory, Madingley Road, Cambridge University, Cambridge, CB3 0HE, England

Abstract

Measurements of the lattice parameters of 1T- and 4Hb-TaS₂ have been made between 300 and 500 K. Discontinuities were observed and measured at the charge-density-wave (CDW) transition temperatures. Observations of the super-lattices in this temperature range indicate that the interactions between CDWs in adjacent layers are much stronger in the 1T polytype. This interaction favours a three-layer repeat and an incommensurate wavevector, and may account for the presence of the ‘nearly commensurate’ phase in 1T-TaS₂.

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X-ray studies of the charge-density wave transitions in TaS₂

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X-ray studies of the charge-density wave transitions in TaS₂