Abstract
The phase transitions in Na-, K-, and Rb-tetracyanoquinodimethanide (TCNQ) single crystals have been investigated by the x-ray critical scattering technique. The intensities of superlattice reflections, which appeared below the phase-transition temperature ${T}_{c}$, decrease with increasing temperature toward ${T}_{c}$ and the diffuse scattering intensities observed above ${T}_{c}$ increase with decreasing temperature. The intensity distribution of x-ray diffuse scattering in the momentum space shows a very strong anisotropy belonging to the ${a}^{*}$ planes, which comes from the one-dimensional crystal instability. These results are discussed in terms of the one-dimensional electron-phonon interaction.
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