Eur. Phys. J. B 1, 39-46 (1998)
https://doi.org/10.1007/s100510050150

Transverse transport in (TM)₂X organic conductors: possible evidence for a Luttinger liquid

¹ Laboratoire de Physique des Solides (URA 02 CNRS) , Université Paris-Sud, 91405 Orsay Cedex, France
² Department of Solid State Physics, Risø National Laboratory, 4000 Roskilde, Denmark
³ Laboratoire de Chimie Structurale Organique, Université des Sciences et Techniques du Languedoc, place E. Bataillon, 34060 Montpellier, France

Corresponding author: ^a moser@lps.u-psud.fr

Received: 28 June 1997
Revised: 4 September 1997
Accepted: 30 September 1997
Published online: 15 January 1998

Abstract

We present c-axis resistivity measurements performed on the organic conductors (TMTSF)₂PF₆ and (TMTTF)₂PF₆ under pressure. The aim is to probe the density of states of quasi-one dimensional compounds the high temperature properties of which are those of a Luttinger liquid. It is found that the 1-D Luttinger description breaks down below a specific pressure-dependent temperature, giving rise to a transient regime. The Fermi liquid behaviour is however restored at low temperature i.e. around 10 K, as evidenced by NMR measurements. Accordingly, two different energy scales 100 K and 10 K are required to get a fair understanding of all observed physical phenomena. Our interpretation supports the picture of a power law exponent K_p for the correlation functions of the order of 0.25-0.30.