Eur. Phys. J. B 7, 529-532 (1999)
https://doi.org/10.1007/s100510050645

Charge localization in organic conductors (TM)₂X: The influence of anion ordering

¹ Laboratoire de Physique des Solides (associé au CNRS) , Université Paris-Sud, 91405 Orsay, France
² Institute of Physics, HR-10000 Zagreb, Croatia

Received: 13 May 1998
Revised: 8 July 1998
Accepted: 9 July 1998
Published online: 15 February 1999

Abstract

An investigation of the different contributions leading to charge localization in a 1/2 or 1/4 filled band 1D conductor has been conducted through a study of transport properties in the solid solution [ (TMTSF)1-x (TMTTF)x] ₂ReO₄. The existence of an ordering transition of the anions allows to identify two contributions to the electronic potential with wave vector 4k_F. A dominant on-site 4k_F potential besides the bond contribution is revealed when Umklapp scattering is pertinent via the weakening of the localization arising at the (0, 1/2, 1/2) anion ordering which is stabilized under pressure in the compound [ (TMTSF) _0.5 (TMTTF)_0.5] ₂ReO₄ at variance with the enhancement of localization observed in the homomolecular (TMTTF)₂ReO ₄ material.