Abstract
A criterion for the preferred direction of the wave vector $\stackrel{\ensuremath{\rightarrow}}{\mathrm{Q}}$ of a charge-density wave (CDW) is obtained by means of a simple theory. Screening of the electric field caused by the CDW is provided by a sinusoidal distortion of the positive-ion lattice. The optimum $\stackrel{\ensuremath{\rightarrow}}{\mathrm{Q}}$ direction is that which minimizes the elastic energy of distortion. For potassium the $\stackrel{\ensuremath{\rightarrow}}{\mathrm{Q}}$ direction is found to be tilted about 4\ifmmode^\circ\else\textdegree\fi{} away from a [110] direction. The exact value of the tilt depends on the magnitude of $\stackrel{\ensuremath{\rightarrow}}{\mathrm{Q}}$.
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