Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 80: Low-Dimensional Systems - Poster Session
TT 80.15: Poster
Wednesday, April 2, 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−nXn (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 TMI=34K and an AFM transition at TAFM=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 ∂ TMI/∂ 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