Abstract
The deformation of the lattice of quasi-one-dimensional conductors with a charge density wave deformed by an electric field has been considered. In the case of the “strong” interaction between the charge density wave and lattice, the effect of the field can be compared to the usual piezoelectric effect with a tremendous piezoelectric modulus that is larger than the value in ionic crystals by a factor of L c/λ (λ is the period of the charge density wave and L c is the coherence length reaching several millimeters upon the sliding of the charge density wave). The interaction between the charge density wave and lattice is likely attributed to the possibility of the interband redistribution of charges (rearrangement of covalent bonds) in the process of the deformation of certain compounds with the charge density wave. The observed and expected effects provide a way of the creation of fundamentally new actuators including those of nanometer sizes.
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The charge density wave itself appears due to the lattice deformation; hence, the notion “interaction between the charge density wave and lattice” is conventional. However, this simple model of the interaction between two elastic bodies well describes the observed effects, as will be seen below.
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The electron density in the conduction band of TaS3, which is known to be equal to half an electron per lattice period (per chain) is obtained under the assumption that the oxidation degrees of the first and second halves of the Ta atoms are +4 and +5, respectively. The ratio of the concentrations of S2− and S− is the same [1, 17]. It is reasonable to assume that the ratio between Ta+4 and Ta+5 can vary with strain. Note also that the charge density wave with triple period, which corresponds to 2/3 electrons per lattice period (per chain) in the conduction band, appears in the NbS3 (type II) isoelectronic compound [1].
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Original Russian Text © V.Ya. Pokrovskiĭ, 2007, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 86, No. 4, pp. 290–293.
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Pokrovskiĭ, V.Y. On the tremendous effect of an electric field on the crystal lattice of quasi-one-dimensional conductors with a charge density wave. Jetp Lett. 86, 260–263 (2007). https://doi.org/10.1134/S0021364007160096
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DOI: https://doi.org/10.1134/S0021364007160096