Abstract
X-ray studies of tetrathiafulvalenium-thiocyanate [TTF${(\mathrm{SCN})}_{0.588}$] show a Peierls instability with one-dimensional charge-density waves near 300 K followed by three-dimensional order at ${T}_{c}=180$ K. Below ${T}_{c}$, an interchain competition between both elastic forces and Coulomb interactions drives a temperature-dependent monoclinic strain. A Landau theory including both charge-density and strain order parameters describes the relative TTF chain slip and the superlattice phase variation.
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