Low temperature heterogeneous dynamics in the commensurate ground state of sulfur quasi4 D compounds (TMTTF)$_2$Br and (TMTTF)$_2$PF$_6$

J.C. Lasjaunias; K. Biljakovic; D. Staresinic; P. Monceau

doi:doi:10.1051/jp4:20020346

Numéro		J. Phys. IV France Volume 12, Numéro 9, November 2002


Page(s)		23 - 26
DOI		https://doi.org/10.1051/jp4:20020346

J. Phys. IV France 12 (2002) Pr9-23
DOI: 10.1051/jp4:20020346

Low temperature heterogeneous dynamics in the commensurate ground state of sulfur quasi4 D compounds (TMTTF) ₂Br and (TMTTF) ₂PF ₆

J.C. Lasjaunias¹, K. Biljakovic², D. Staresinic² and P. Monceau¹

¹ Centre de Recherches sur les Très Basses Températures, CNRS, BP. 766, 38042 Grenoble cedex 9, France
² Institute of Physics, P.O. Box 304, 70001 Zagreb, Croatia

Abstract
We report on a study of the slow dynamics of the heat relaxation at very low temperature (T $\leq$ 1 K) in the nominally commensurate ground states of the sulfide compounds (TMTTF) ₂Br and (TMTTF) ₂PF ₆, commensurate SDW - or antifernomagnetic - and spin-Peierls, respectively. For both systems, the long-time dynamics at equilibrium shows a bimodal character, which can be analysed by slow and fast gaussian distributions $g(\log\tau )$ , separated by one decade in time, which can originate from defects of commensurability.

Low temperature heterogeneous dynamics in the commensurate ground state of sulfur quasi4 D compounds (TMTTF) 2Br and (TMTTF) 2PF 6

Low temperature heterogeneous dynamics in the commensurate ground state of sulfur quasi4 D compounds (TMTTF) ₂Br and (TMTTF) ₂PF ₆