J. Phys. IV France 09 (1999) Pr10-53-Pr10-54
Slow dynamics of energy relaxation in the commensurate SDW ground state of (TMTTF)2BrJ.C. Lasjaunias1, K. Biljakovic1, 2, D. Staresinic2, P. Monceau1 and J.M. Fabre3
1 CRTBT-CNRS associé à l'UJF, BP. 166, 38042 Grenoble cedex 9, France
2 Institute of Physics, P.O. Box 304, 1000 Zagreb, Croatia
3 Laboratoire de Chimie Organique Structurale, USTL, 34060 Montpellier, France
We present a study of the slow dynamics in the heat relaxation at very low temperature (T < 1 K) in the nominally commensurate SDW compound (TMTTF)2Br, that we compare to the incommensurate SDW-(TMTSF)2PF6. Instead of a broad distribution of relaxation times g(log r) in the PF6 salt, the dynamics in the Br salt reveals almost "discrete bands" in the relaxation spectrum. A saturation towards equilibrium is reached very rapidly (within ˜ 20 mn) at T ˜ 100 mK in comparison with PF6 (more than 10 hr for the same temperature).
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