Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Superconductivity: Fe-based Superconductors - FeSe and others
TT 59.6: Vortrag
Donnerstag, 23. März 2017, 10:45–11:00, HSZ 103
Ultrathin FeSe films on Bi2Se3(0001) studied by STM and STS — •Jonas Warmuth, Udai Raj Singh, Verena Markmann, Jens Wiebe, and Roland Wiesendanger — Dept. of Physics, Hamburg University, Hamburg, Germany
Thin film iron chalcogenide superconductors have recently attracted interest due to an increase in transition temperatures as compared to the bulk material [1]. We report on the structural and electronic properties of ultrathin FeSe films grown on Bi2Se3(0001) [2]. Scanning tunnelling microscopy (STM) reveals FeSe thin films in the tetragonal phase with heights of one and two unit cells (UC) in respect to the Bi2Se3 surface. We observe striped moiré patterns and dumb-bell shaped defects on the FeSe films. Scanning tunnelling spectroscopy (STS) does not show any signature of a superconducting gap in the tunnelling spectra on the one and two UC thick FeSe islands down to 6.5 K [3]. These spectra rather show an asymmetric behaviour and a finite density of states at the Fermi level similar to spectra on bulk FeSe.
I. Bozovic et al 2014 Nature Physics 10 892
Y. Wang et al 2012 J. Phys: Condensed Matter 24 47
U. Singh et al 2016 J. Phys: Condensed Matter 29 2