Landau theory interpretation of the commensurate superlattice structure of 2H-TaSe2

The Landau theory of charge density wave states in 2H-TaSe2 is re-examined in the light of the commensurate superlattice structure determination by Bird, McKernan and Steeds (1985). It is shown that interlayer interactions play a far more important role in determining the phasing of the CDW/PSD than has been previously assumed. Some consequences of this for the nature of incommensurate states and the interpretation of previous experimental data are also discussed.

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