Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: Electronic Structure of Surfaces: Spectroscopy, Surface States
O 46.2: Poster
Dienstag, 21. März 2017, 18:30–20:30, P1A
STM-Investigations of κ-(BEDT-TTF)2X-Charge Transfer Salts — •Torge Mashoff, Johannes Regel, and Hans-Joachim Elmers — Institut für Physik, Johannes Gutenberg-Universität, Mainz
Organic charge-transfer salts of the κ-(BEDT-TTF)2X family offer exciting many-body physics manifesting in an interesting phase diagram with a neighboring superconducting and Mott insulating phase. This results in a strong deviation of the superconducting properties from BCS theory and has been attributed to their two-dimensional structure leading to electronic correlation effects. We investigated small crystals of the two charge-transfer salts κ-(BEDT-TTF)2Cu[N(CN)2]Br and κ-(BEDT-TTF)2Cu(NCS)2 using a low temperature scanning tunneling microscope and obtained good topographic resolution of the crystallographic structure. Both crystals show similar crystallographic order but due to the higher chemical pressure of κ-(BEDT-TTF)2Cu(NCS)2, they have different positions in the phase diagram. We used scanning tunneling spectroscopy to investigate the electronic properties and the influence of the proximity to the Mott phase.