Slow energy relaxation at low temperature in quasi-1D organic conductors

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

doi:doi:10.1051/jp4:2000319

Numéro		J. Phys. IV France Volume 10, Numéro PR3, March 2000 Organic Superconductivity "20^th Anniversary"


Page(s)		Pr3-177 - Pr3-182
DOI		https://doi.org/10.1051/jp4:2000319

Organic Superconductivity "20^th Anniversary"

J. Phys. IV France 10 (2000) Pr3-177-Pr3-182
DOI: 10.1051/jp4:2000319

Slow energy relaxation at low temperature in quasi-1D organic conductors

J.C. Lasjaunias¹, K. Biljakovic^{1, 2} and P. Monceau¹

¹ CRTBT-CNRS, associé à l'UJF, BP. 166, 38042 Grenoble Cedex 9, France e-mail : lasjau@labs.polycnrs-gre.fr & monceau@labs.polycnrs-gre.fr
² Institut of Physics, P.O. Box 304, HR-1000 Zagreb, Croatia e-mail : katica@ifs.hr

Abstract
We present a study of the slow dynamics in the heat relaxation at very low temperature ( T < 1) in the nominally commensurate SDW compound (TMTTF)₂Br, that we compare to the incommensurate SDW-(TMTSF)PF₆. Instead of a broad distribution of relaxation times g( log σ ) in the PF₆ salt typical ₂of glassy materials, 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 a few days for the same temperature).