Dresden 2014 – wissenschaftliches Programm
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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 Wurmehl1,2, Bernd Büchner1,3, and •Christian Hess1,3 — 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.