engleski

Bimodal energy relaxation in quasi-one-dimensional compounds with commensurate modulated ground state

We show that the low temperature (T <0.5 K) time dependent nonexponential energy relaxation of quasi-one-dimensional compounds strongly differs according to the nature of their modulated ground state. For incommensurate ground states, such as in (TMTSF2PF6 the relaxation time distribution is homogeneously shifted to larger time when the duration of the heat input is increased, and exhibits, in addition, a scaling between the width and the position of the peak in the relaxation time distribution, w2&lntm. For a commensurate ground state, as in (TMTTF)2PF6, the relaxation time spectra show a bimodal character with a weight transfer between well separated slow and fast entities. Our interpretation is based on the dynamics of defects in the modulated structure, which depend crucially on the degree of commensurability.

complex relaxation; heterogeneity; commensurability; density wave

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