Abstract:We investigated magnetic vortices in two stoichiometric LiFeAs samples by means of scanning tunneling microscopy and spectroscopy. The vortices were revealed by measuring the local electronic density of states (LDOS) at zero bias conductance of samples in magnetic fields between 0.5 and 12 T. From single vortex spectroscopy we extract the Ginzburg-Landau coherence length of both samples as 4.4 ± 0.5 nm and 4.1 ± 0.5 nm, in accordance with previous findings. However, in contrast to previous reports, our study r… Show more
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