Commensurability Pinning versus Impurity Pinning of One-Dimensional Charge Density Wave

概要

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Competition between the commensurability pinning and the inapurity pinningon the existence of the long range order is examined at absolute zero in the caseof the weak impurity pinning of the one-dimensional charge density wave. Thereexists a critical value of the commensurability energy, l.7d=1.4, which separatesthe state with long range order (charge density wave (CDW) state) and that with-out it (charge density glass (CDG) state). Here lg and d are the domain size in theabsence of commensurability energy and the size of a soliton in the absence of theimpurity potential respectively. It is argued that near the boundary of the CDWstate and CDG state the average of the formation energy of a localized excitation(a soliton) is decreased whereas that of a extended excitation (a phason) remainessentially unchanged.
社団法人日本物理学会の論文
1978-11-15