Charge density waves: sliding and related phenomena in NbSe 3 and other transition-metal chalcogenides

Abstract
The establishment of charge density waves (c.d.ws) in NbSe 3 and the phenomena associated with their sliding are examined against the background of behaviour presented for a variety of other stranded transition metal chalcogenides. The work has been set in terms ofdiscom mensuration arrays, but with these not so highly defined as in the author’s previous work, where the discommensuration array was used as a generator of regular soliton shot noise. The a.c. noise signal is now related rather to creation and destruction of the spatial modulation of the c.d.w. itself, occurring in close proximity to the contacts, with the characteristic length as λ. The discommensuration array governs the depinning processes from lattice and impurities. The differences between NbSe 3 and m - and o -TaS 3 have been examined, and related results on [Ta(Se 4 )] 2 I and other seleno-halides are discussed in conjunction with results from TaTe 4 , ZrTe 3 , ZrTe 5 , etc. to provide an overview of the materials aspect of the field. Suggestions are made for further experiments.

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