Commensurate Ordering in Tetrathiafulvalene-Tetracyanoquinodimethane
- 29 November 1976
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 37 (22) , 1517
- https://doi.org/10.1103/physrevlett.37.1517
Abstract
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.Keywords
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