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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.21: Poster

Montag, 31. März 2014, 15:00–19:00, P2

Investigation of the electronic properties of the dual-layered charge transfer salt κ-α′-(BEDT-TTF)₂Ag(CF₃)₄(TCE) — •Michaela Altmeyer, Roser Valenti, and Harald O. Jeschke — Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany

In recent experimental work the synthesis of κ-α′-(BEDT-TTF)₂Ag(CF₃)₄(TCE) was achieved, which was reported to be a superconductor below a critical temperature of 11.1K. The crystal is the first superconducting dual-layered charge transfer salt containing BEDT-TTF and consists of alternating layers of κ- and α′-type packed BEDT-TTF molecules. While there are superconductors in the family of (BEDT-TTF)₂X salts with a κ-type packing motif, the α′-type packed charge transfer salts tend to be Mott-Hubbard-insulators. Therefore we investigate the electronic properties of the dual-layered system within density functional theory. We compare the electronic structure to that of single-layered compounds with α′-type and with κ-type arrangement of BEDT-TTF molecules. This allows us to disentangle the more complex electronic structure of the title compound.