Dresden 2014 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 80: Low-Dimensional Systems - Poster Session

TT 80.15: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Resistivity measurements on the quasi-two-dimensional organic conductor κ-(BEDT-TTF)₂Hg(SCN)₂Cl — •Sebastian Köhler¹, John Schlueter², and Michael Lang¹ — ¹Physikalisches Institut, Goethe-Universität Frankfurt(M), SFB/TR49, D-60438 Frankfurt(M), Germany — ²Material Science Division, Argonne National Laboratory, Argonne, IL 60439-4831, USA

The organic charge-transfer salt κ-(BEDT-TTF)₂Hg(SCN)₂Cl is a member of the family of (BEDT-TTF) or short - (ET)-based organic conductors in which conducting layers formed by ET molecules alternate with insulating anion layers. Notably the κ-type configuration is of high interest as these compounds exhibit a rich phase diagram containing metallic, (Mott-)insulating and even superconducting behaviour which can be easily accessed either by chemical pressure or by applying hydrostatic physical pressure. In contrast to the extensively studied copper-based salts, the monoclinic κ-(ET)₂Hg(SCN)_3−nX_n (X=Cl,Br; n=1,2) compounds use mercury as metallic ion in the anion layer. At ambient pressure and high temperatures κ-(ET)₂Hg(SCN)₂Cl exhibits metallic behaviour with a metal-to-insulator transition at T_MI=34K and an AFM transition at T_AFM=27K [1].We present resistivity measurements of κ-(ET)₂Hg(SCN)₂Cl at various hydrostatic pressure values provided by using ⁴He as pressure-transmitting medium.We find a significant shift of the metal-to-insulator transition to lower temperatures with a rate ∂ T_MI/∂ p ≈ 0.3K/MPa and an increase in metallicity at lower temperatures similar to the behaviour observed for κ-(ET)₂Cu[N(CN)₂]Cl. [1]Yasin et al., Physica B 407 (2012) 1689