Is is suggested that the first-order instability in tetrathiafulvalene-tetracyanoquinodimethane [(TTF)-(TCNQ)] at 38 K is related to the fourth-order umklapp coupling which concerns the wave vectors of the star involved in the three-dimensional periodic ordering. Within the anharmonic TCNQ interchain-coupling model, we predict that the configuration of chain deformation changes abruptly at 38 K, provided that this coupling is attractive.
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Bjeliš et al. (1976) studied this question.
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