Abstract
The a.c. conductivity of an overdamped one dimensional sine-Gordon system with a low density of kinks is evaluated. This corresponds to a nearly commensurate charge or spin density wave with a kink-lattice representing the deviation from commensurability. The results explain the unusually broad crossover regime of NbSe 3 as compared with the similar but more commensurate compound TaS 3. When TaS 3 becomes commensurate ( T ⪅ 130 K) we predict that its a.c. response increases and its shape slightly sharpens.
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