Model for non-linear conductivity of charge-density waves with strong impurity pinning

A phenomenological model for the dynamics of a moving charge-density wave (CDW) is presented in order to describe the non-linear response of the CDW to a dc field. It is a modification of the classical model. Deformations of the CDW around impurity centers are taken into account but long-range order...

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Bibliographic Details
Published in:Solid state communications 1984, Vol.49 (1), p.19-22
Main Authors: Tua, P.F., Zawadowski, A.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
Electronic transport in condensed matter
Exact sciences and technology
High-field and nonlinear effects
Physics
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Summary:A phenomenological model for the dynamics of a moving charge-density wave (CDW) is presented in order to describe the non-linear response of the CDW to a dc field. It is a modification of the classical model. Deformations of the CDW around impurity centers are taken into account but long-range order is preserved so that the model describes a single domain. Fluctuations in the impurity distribution are neglected. In the strong-pinning case the dc conductivity turns out to be non-singular at the threshold and fits the experimental data reasonably well. In the weak-pinning limit there is no threshold field. A comparison with other models is attempted.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(84)90552-0