Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 88: Electronic Structure of Surfaces II
O 88.4: Vortrag
Donnerstag, 4. April 2019, 15:45–16:00, H26
Growth and electronic properties of Fe on Nb(110) studied by STM and STS — •Johannes Jung, Niclas Schmidt, Artem Odobesko, and Matthias Bode — Physikalisches Institut, Universität Würzburg, Am Hubland, Würzburg, Germany
Superconductivity and ferromagnetism with the underlying singlett and triplett pairing mechanisms, respectively, are often considered two antagonistic phenomena. Here we report on the investigation of the growth and the electronic properties of Fe on the Nb(110) surface, which exhibits the highest Tc = 9.2 K of all elements. In the submonolayer range we observe three kinds of Fe–islands which exhibit different surface patterns. Spatially resolved data taken at the boundary between the superconductor and the ferromagnet show a narrow transition region with a width wsc−fm = 1.5 ± 0.5 nm. On Fe monolayer islands a small but finite conductance dip with a 10-20% reduction remains visible in normalized STS data, indicating that the superconducting wave function has a non-zero probability amplitude at the tip position. We will present date on the dependence of surface superconductivity of Nb(110) on Fe coverage and discuss implications in the context of topological superconductivity and Majorana fermions.