Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 68: Transport: Majorana Fermions
TT 68.4: Vortrag
Donnerstag, 10. März 2016, 11:15–11:30, H19
Real space mapping of Yu-Shiba-Rusinov states of an extended magnetic scatterer on a conventional superconductor — •Markus Etzkorn1, Matthias Eltschka1, Berthold Jäck1, Andreas Topp1, Christian R. Ast1, and Klaus Kern1, 2 — 1Max-Planck-Institute for Solid State Research, 70569 Stuttgart, Germany — 2École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
The interaction of a local magnetic impurity with a superconductor causes the formation of Yu-Shiba-Rusinov (YSR)states in the vicinity of the impurity. These have recently received increasing attention in the context of Majorana Fermions and other exotic states that might be created from the mutual interplay. YSR states have been extensively studied by scanning tunneling microscopy and so far have been discussed mainly in the limit of point scattering impurities. Here we present our investigations of the local properties of single magnetic Copper-Phthalocynaine molecules on the (5x1) reconstructed, superconducting V(100) surface measured at 15 mK temperature. We find very intense YSR states with energies that depend on the precise absorbtion geometry of the molecule. At the same time we find no indication of a local suppression of the superconducting gap around the impurity. We follow the state evolution in real space for about 3 nm corresponding to about three orders of magnitude in spectral intensity. The spectra display rich structure with local variations in the electron-hole asymmetries. The observed intensity changes in the spectra can not be described on the basis of a single point like scattering potential.