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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.13: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Observation of a highly ordered vortex lattice in LiFeAs — •Sven Hoffmann¹, Christian Salazar¹, Pavlo Khanenko¹, Danny Baumann¹, Ronny Schlegel¹, Saicharan Aswartham¹, I. Morozov², Bernd Büchner¹, and Christian Heß¹ — ¹IFW Dresden, Helmholtzstraße 20, D-01069 Dresden — ²MSU, Leninskiye Gory 1, R-119991 Moscow

Unlike other Fe-based superconductors, LiFeAs is a stoichiometric superconductor, showing no trace of nematic order, charge ordering or magnetic ordering and no Fermi surface nesting, while still maintaining a fairly high transition temperature. To gain additional information about the order parameter in this material we performed low temperature scanning tunneling microscopy and spectroscopy measurements. Differential conductance maps revealed a highly ordered vortex lattice, even at high magnetic fields. These findings contradict previous reports, where substantially disordered vortex lattices were observed at a broad range of magnetic fields, indicative of a strong pinning effect and small coherence length in LiFeAs. Our data therefore suggest weaker pinning and a substantially larger coherence length for this sample as compared to previous reports.