J. Phys. IV France
Volume 114, April 2004
Page(s) 41 - 44

J. Phys. IV France
114 (2004) 41
DOI: 10.1051/jp4:2004114007

Longitudinal and transverse transport of the quasi-one dimensional organic conductor TMTTF 2PF 6 studied under high pressure

P. Auban-Senzier1, D. Jérome1, C. Carcel2 and J.M. Fabre2

1  Laboratoire de Physique des Solides, Bât. 510, Université Paris-Sud, 91405 Orsay, France
2  Laboratoire Hétérochimie et Matériaux Organiques, ENSCM/ESA-5076, 34296 Montpellier Cedex 5, France


We report the first extensive study of longitudinal ( $\rho_{a})$ and transverse ( $\rho_{c})$ transport properties versus temperature of the organic quasi one dimensional conductor TMTTF 2PF 6 over the pressure domain extending from ambient up to 26 kbar. The dimensional cross over observed around 14 kbar separates a 1D region dominated by the Mott-Hubbard gap with activated transport at low pressure from a 3D domain where the temperature range of the metallic behavior, extends up to room temperature along the chains and is progressively increased towards high temperatures in the c direction. In the 1D regime, the different activations obtained from $\rho _{a}$(T) and $\rho _{c}$(T) data suggest two different modes of conduction in the longitudinal and transverse directions. Key words. High pressure - 1D molecular conductors - High electron-electron correlations - Luttinger liquid.

© EDP Sciences 2004