Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 80: Low-Dimensional Systems - Poster Session

TT 80.10: Poster

Wednesday, April 2, 2014, 15:00–19:00, P2

Under-pressure measurements of resistivity and magnetic susceptibility and the pressure-temperature phase diagram of (DOEO)₄[HgBr₄]TCE organic charge-transfer crystals — •Alisa Chernenkaya^1,2, S. Köhler³, E. Gati³, V. Ksenofontov⁴, K. Medjanik², A. Kotov⁵, R. Morgunov⁵, E. Yagubskii⁵, H.-J. Elmers², M. Lang³, and G. Schönhense² — ¹Graduate School Materials Science in Mainz, 55128, Mainz, Germany — ²Inst. für Physik, JGU, 55128, Mainz, Germany — ³Phys. Inst., J.W. GUF, 60438, Frankfurt am Main, Germany — ⁴Inst. für Anorg. und Analyt. Chem., JGU, 55128, Mainz, Germany — ⁵Inst. of Probl. of Chem. Phys., RAS, 142432 Chernogolovka, Russia

The asymmetrical molecule DOEO (1,4-(dioxandiil-2,3-dithio) ethylenedithiotetrathiafulvalene)is the essential building block of the cation-radical salt (DOEO)₄[HgBr₄]TCE (TCE is 1,1,2-trichloroethane) [1].

It was shown before that the temperature dependence of resistivity of (DOEO)₄[HgBr₄]TCE at ambient pressure is non-trivial [1]. There is a maximum at T = 120 K and a minimum at T = 70 K in resistivity. We found evidence of an antiferromagnetic phase existing below 40 K. (DOEO)₄[HgBr₄]TCE is a possible candidate for a superconducting state below 7 K due to the comparability to BEDT-TTF salts. We performed characterization of phases and phase transitions and present a tentative pressure-temperature phase diagram.

Funded by DFG (Transregio TR49).
A. Bardin et. al., Coord. Chem., 32, 88 (2006).