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TT: Fachverband Tiefe Temperaturen

TT 45: Superconductivity: Fe-based Superconductors - 1111,111, FeSe

TT 45.4: Vortrag

Dienstag, 1. April 2014, 14:45–15:00, HSZ 201

Magnetic Vortices in LiFeAs as seen by Scanning Tunneling Spectroscopy — Ronny Schlegel¹, Pranab Kumar Nag¹, Danny Baumann¹, Robert Beck¹, Sabine Wurmehl^1,2, Bernd Büchner^1,3, and •Christian Hess^1,3 — ¹Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, 01171 Dresden, Germany — ²Institut für Festkörperphysik, TU Dresden, 01069 Dresden — ³Center for Transport and Devices of Emergent Materials, TU Dresden, 01069 Dresden, Germany

We performed investigations of the Shubnikov phase of LiFeAs in high magnetic fields up to 12 Tesla using scanning tunneling microscopy and spectroscopy. In our measurements the location of individual magnetic vortices can clearly be identified from the spatial variation of the zero bias differential conductance. We determine the Ginzburg-Landau coherence length from our data, as well as the nearest neighbor lattice constant, which we compare with results from complementary methods.