Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 73: Scanning Probe Methods II
O 73.5: Vortrag
Donnerstag, 3. April 2014, 11:30–11:45, WIL A317
The Zeeman Effect in dimensionally confined, superconducting STM tips — •C. R. Ast1, M. Eltschka1, B. Jäck1, M. Assig1, M. Etzkorn1, O. V. Kondrashov2, M. A. Skvortsov2,3, and K. Kern1 — 1MPI for Solid State Research, Stuttgart — 2Moscow Institute of Physics and Technology, Moscow, Russia — 3Landau Institute for Theoretical Physics, Chernogolovka, Russia
It has been shown in the 1970s that in thin films superconductivity persists in much higher magnetic fields than in the bulk. The resulting Zeeman splitting of the spin-polarized electrons has been used to measure the absolute spin-polarization of electrons in planar tunnel junctions. Transferring this concept to the superconducting tip in a scanning tunneling microscope, it is not a priori clear that the dimensional confinement at the tip apex is suitable to produce a similar effect. We show both experimentally and theoretically that this effect can be observed in scanning tunneling spectroscopy. The parameters for successful tip preparation as well as possible applications will be discussed.