https://doi.org/10.1140/epjb/e2002-00258-x
Electronic localization in an extreme 1-D conductor: the organic salt (TTDM-TTF)2 [Au(mnt)2]
1
Instituto Tecnológico e Nuclear, 2686-953 Sacavém, Portugal
2
Institut de Ciència de Materials de Barcelona (CSIC), Campus de la UAB, 08193
Bellaterra, Spain
3
Laboratoire de Physique des Solides, Université Paris-Sud (UMR 8502 CNRS) , 91405
Orsay, France
4
Instituto Superior Técnico, 1049-001 Lisboa, Portugal
Corresponding author: a malmeida@itn.pt
Received:
15
April
2002
Revised:
17
June
2002
Published online:
17
September
2002
This article reports the investigation of a new low-dimensional organic salt, (TTDM-TTF)2 [Au(mnt)2] , by single crystal X-ray diffraction, static magnetic susceptibility, EPR, thermopower, electrical resistivity measurements under pressure up to 25 kbar and band structure calculations. The crystal structure consists in a dimerized head to tail stacking of TTDM-TTF molecules separated by layers of orthogonal Au(mnt)2 anions. The absence of overlap between neighboring chains coming from this particular crystal structure leads to an extreme one-dimensionality (1-D) for which the carriers of the half-filled conduction band become strongly localized in a Mott-Hubbard insulating state. This material is the first 1-D conductor in which the Mott-Hubbard insulating character cannot be suppressed under pressure.
PACS: 72.80.Le – Polymers; organic compounds / 72.20.Pa – Thermoelectric and thermomagnetic effects
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002
