A model for phase transitions in Tetrathiafulvalene-Tetracyanoquinodimethane (TTF-TCNQ) |
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Authors: | B. Horovitz D. Mukamel |
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Affiliation: | 1. Laboratory of Atomic and Solid State Physics, USA;2. Materials Science Center, Cornell University, Ithaca, NY 14853, U.S.A. |
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Abstract: | The observed phase transitions in Tetrathiafulvalene-Tetracyanoquinodimethane (TTF-TCNQ) are discussed using a simple model for the interchain coupling of charge density waves. Estimates based on Coulomb energies show that for 38 K < T < 49 K the components and qz of the wave vector associated with the charge density wave satisfy , with and T2 = 49 K. A possible mechanism for the first order transition at 38 K is proposed. The results are compared with neutron and X-ray scattering and with isotope shifts of the transition temperatures. |
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