Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.11: Poster

Mittwoch, 28. März 2012, 15:00–19:00, Poster B

Superconducting LiFeAs as seen by Scanning Tunneling Microscopy/Spectroscopy — •Rico Pohle, Martha Scheffler, Ronny Schlegel, Torben Hänke, Danny Baumann, Anne Bachmann, Dirk Bombor, Steffen Sykora, Luminita Harnagea, Sabine Wurmehl, Christian Hess, and Bernd Büchner — Institut für Festkörperforschung IFW Dresden

Among the entire class of iron-based superconductors the material LiFeAs is of particular interest since an absence of nesting between electron and hole pockets suggests an unconventional type of pairing in this material. Using Scanning Tunnelling Microscopy (STM) and Spectroscopy (STS) we investigate topographic properties of the surface as well as the temperature dependency of the superconducting gap. The good agreement of our results with model calculations for the tunnelling conductance allows us to draw conclusions about the low energy properties of the superconducting system. Furthermore, we compare our results with Transport- and NMR-measurements.