Berlin 2018 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 31: Poster Session II

DS 31.24: Poster

Donnerstag, 15. März 2018, 11:15–13:15, Poster F

Scanning Tunneling Microscopy and Spectroscopy of thin films of Strontium Ruthenates — •Marion A. van Midden, Tjaša Parkelj, Jernej Mravlje, Rok Žitko, Matjaž Spreitzer, and Erik Zupanič — Jožef Stefan Institute, Ljubljana, Slovenia

Because the energy scales of charge, spin, lattice, and orbital degrees of freedom of 4d- and 5d- transitional metal oxides are comparable, they exhibit a wide range of distinct electronic and magnetic properties. In the case of perovskite type transitional metal oxides these materials are also extremely sensitive to perturbations and can therefore be tuned via nonthermal parametrs such as doping, pressure, and magnetic fields. Growing thin films allows us to introduce strain via lattice mismatch with the substrate and thereby tune the properties of the film.

The films of SrRuO₃ were grown on SrTiO₃ using Pulsed Laser Deposition. The back-pressure in the system is below 10⁻⁹ mbar, which enables growth with a relatively small concentration of impurities. Growth was controlled in-situ using Reflected High-Energy Electron Diffraction. Using an ultra-high vacuum (UHV) suitcase the samples were transported to an UHV system equiped with Low-Energy Electron Diffraction and a Nanonis Joule-Thomspon Scanning Tunneling Microscope. Topography and spectroscopy measurements were done on clean surfaces and in the vicinity of defects.