DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2017 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 56: Poster Session: Low-Dimensional Systems

TT 56.17: Poster

Wednesday, March 22, 2017, 15:00–19:00, P2-OG4

Transport and thermodynamic studies of the metal-insulator transition in κ-(BEDT-TTF)2Hg(SCN)2Cl under He-gas pressure — •Caroline Delleske1, David Zielke1, Elena Gati1, Harald Schubert1, John A. Schlueter2, and Michael Lang11Physikalisches Institut, SFB/TR49, Goethe Uni Frankfurt, DE — 2Materials Science Division, NSF, Arlington, Virginia, USA

Organic charge-transfer salts show a wide variety of electronic phases resulting from strong electron correlations in low dimensions, such as superconductivity or multiferroicity. The members of the κ-(BEDT-TTF)2X family are representing model systems to investigate the interplay of strong on-site and inter-site Coulomb repulsion in 2D. Here we focus on the less intensively studied system κ-(BEDT-TTF)2Hg(SCN)2Cl [1, 2], showing a metal-insulator (MI) transition at TMI ≈ 30 K which has been assigned to charge-order [1]. We report on a detailed characterization of the material’s low-temperature properties by transport and thermodynamic measurements at ambient pressure, as well as under finite He-gas pressure. We find a slightly broadened MI transition, consistent with literature [2], which can be rapidly suppressed with increasing pressure. Surprisingly, no indications for superconductivity can be found up to pressures of p = 300 MPa and temperatures down to T = 2.4 K. In addition, we will present thermodynamic studies of the specific heat and thermal expansion to unravel the role of spin and lattice degrees of freedom at TMI.

[1] N. Drichko et al., PRB 89, 075133 (14)

[2] S. Yasin et al., Physica B 407, 1689 (12)

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2017 > Dresden