J. Phys. IV France
Volume 114, April 2004
Page(s) 497 - 499

J. Phys. IV France
114 (2004) 497
DOI: 10.1051/jp4:2004114115

Structural and electrical properties of (DT-TTF) $\mathsf{_{2}}$[ Cu(mnt) $\mathsf{_{2}}$]

J.C. Dias1, E.B. Lopes1, I.C. Santos1, M.T. Duarte1, R.T. Henriques2, M. Almeida1, 1, X. Ribas3, C. Rovira3, J. Veciana3, P. Foury-Leylekian4, J.-P. Pouget4, P. Auban-Senzier4 and D. Jérome4

1  Departamento de Química, Instituto Tecnológico e Nuclear, 2686-953 Sacavém, Portugal
2  Departamento de Engenharia Química, Instituto Superior Técnico, 1049-001 Lisboa, Portugal
3  Instituto de Ciència de Materiales de Barcelona, CSIC, Campus de la UAB, 8193 Bellaterra, Spain
4  Laboratoire de Physique des Solides, Bâtiment 510, Univ. Paris-Sud, 91405 Orsay, France

Transport properties of (DT-TTF) 2[ Cu(mnt) 2] show a semiconducting behaviour comparable to the one of the isostructural Au analogue but with a sharp 2 $^{\rm nd}$ order phase transition at T $_{\rm c}$=235 K. Under pressure, T $_{\rm c}$ decreases and the compound becomes metallic above T $_{\rm c}$ for pressures higher than 15 kbar. The X-ray scattering study shows that the transition at T $_{\rm c}$ corresponds to a dimerisation of the molecules along the stacking direction. Key words. Electrical conductivity - X-ray scattering - Pressure studies - Spin-ladder compounds.

© EDP Sciences 2004