Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 49: Poster Session: Superconductivity
TT 49.13: Poster
Wednesday, April 3, 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.