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The observed structural phase transitions in tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) are analyzed using a Landau-Ginzburg-type free energy. It is shown that because of a coupling between the components qₐ and qc of the wave vector associated with the charge-density wave, the latter is expected to be nonzero for $38<T<47$ ^∘{}K, contrary to previous expectations.
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David Mukamel (1977) studied this question.
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