Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Poster: Electronic Structure of Surfaces: Spectroscopy, Surface States
O 51.10: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster B
STM-Investigations of κ-(BEDT-TTF)2 X-Charge Transfer Salts — •Johannes Regel1, Torge Mashoff1, Harald Schubert2, Michael Lang2, Jens Müller2, and Hans-Joachim Elmers1 — 1Institut für Physik, Johannes Gutenberg-Universität, Mainz — 2Physikalisches Institut, Goethe-Universität, Frankfurt
Organic charge-transfer salts of the κ-(BEDT-TTF)2 X (short: κ-X) family share essential features with cuprates regarding their superconducting state. In both classes of materials, the electronic structure is quasi two dimensional and superconductivity emerges in the vicinity of the Mott insulating phase, resulting in a strong deviation of the superconducting properties from BCS theory.
We investigate small crystals of the two charge-transfer salts κ-Cu[N(CN)2 ]Br and κ-Cu(NCS)2 using a low temperature scanning tunneling microscope and obtain good topographic resolution of the crystallographic structure. Due to the higher chemical pressure of κ-Cu(NCS)2, the two salts differ in the proximity to the Mott phase. We use scanning tunneling spectroscopy to investigate this influence and the electronic properties of the samples.