E Tafra et al 2012 J. Phys.: Condens. Matter 24 045602 doi:10.1088/0953-8984/24/4/045602
E Tafra1, M Čulo2, M Basletić1, B Korin-Hamzić2, A Hamzić1 and C S Jacobsen3
Show affiliationsWe have measured the Hall effect on recently synthesized single crystals of the quasi-one-dimensional organic conductor TTF–TCNQ (tetrathiafulvalene–tetracyanoquinodimethane), a well known charge transfer complex that has two kinds of conductive stacks: the donor (TTF) and the acceptor (TCNQ) chains. The measurements were performed in the temperature interval 30 K < T < 300 K and for several different magnetic field and current directions through the crystal. By applying the equivalent isotropic sample approach, we have demonstrated the importance of the choice of optimal geometry for accurate Hall effect measurements. Our results show, contrary to past belief, that the Hall coefficient does not depend on the geometry of measurements and that the Hall coefficient value is approximately zero in the high temperature region (T > 150 K), implying that there is no dominance of either the TTF or the TCNQ chain. At lower temperatures our measurements clearly prove that all three phase transitions of TTF–TCNQ could be identified from Hall effect measurements.
71.20.Rv Polymers and organic compounds
64.70.K- Solid–solid transitions
72.80.Le Polymers; organic compounds (including organic semiconductors)
Soft matter, liquids and polymers
Issue 4 (1 February 2012)
Received 19 September 2011, in final form 15 November 2011
Published 4 January 2012
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