Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: f-Electron Systems and Heavy Fermions I
TT 5.4: Vortrag
Montag, 12. März 2018, 10:15–10:30, H 3005
Investigation of the surface properties of SmB6 by STM — •Lin Jiao1, Sahana Rössler1, Priscila F. S. Rosa2,3, LiuHao Tjeng1, Zachary Fisk2, Frank Steglich1, and Steffen Wirth1 — 1Max-Planck-Institute for Chemical Physics of Solids, Dresden, Germany — 2Department of Physics, University of California, Irvine, California, USA — 3Los Alamos National Laboratory, Los Alamos, New Mexico, USA
We present scanning tunneling microscopy and spectroscopy measurements on SmB6, which is a candidate material for a topological Kondo insulator. The measurements were conducted on non-reconstructed (001) surfaces [1,2] at temperatures down to 0.35 K. At these low temperatures, we observe several well-resolved states within the hybridization gap of SmB6. The temperature evolution of the tunneling spectra indicates two energy scales, in line with bulk and surface Kondo effect, respectively [3]. Moreover, we can put our results into perspective with the predicted existence of topologically protected surface states. In this respect, we will also present spectroscopic as well as resistivity results on substituted samples (Sm1−xRx)B6 for R = Gd, Y, Yb and, in particular, discuss the influence of magnetic substituents on the topological surface states.
S. Rößler et al., Proc. Natl. Acad. Sci. USA 111, 4798 (2014).
S. Rößler et al., Phil. Mag. 96, 3262 (2016).
L. Jiao et al., Nat. Commun. 7, 13762 (2016).