Regensburg 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 53: Magnetic Heuslers, half-metals and oxides

MA 53.12: Vortrag

Freitag, 5. April 2019, 12:30–12:45, H33

Stabilization of metallic phase in epitaxial NdNiO3 films by Nd excess — Henrike Probst¹, •Marius Keunecke¹, Sebastian Merten¹, Vladimir Roddatis², Daniel Steil¹, Sabine Steil¹, Stefan Mathias¹, and Vasily Moshnyaga¹ — ¹Erstes Physikalisches Institut, Georg-August-Universität Göttingen — ²Institut für Materialphysik, Georg-August-Universität Göttingen

Rare earth nickelates (RENiO3, RE=Sm, Nd, Pr, etc.) are well known for their rich phase diagram, controlled by strong electron-lattice electronic interactions, the mechanism of which is still not well understood. We report the growth of epitaxial NdNiO3 (NNO) thin films by metalorganic aerosol deposition (MAD) technique on (100)- and (111)-oriented LaAlO3 and SrTiO3 substrates. The stoichiometric films demonstrate a metal-insulator (MI) transition, coupled to a structural (orthorhombic/monoclinic) phase transition at Tmi=120-160 K, depending on the epitaxy stress and film thickness. Over stoichiometric films with Nd/Ni ratio>1.5 show overall metallic behavior, remaining in the orthorhombic structure even at low temperatures. We believe the suppression of MI transition is related to a unique nanostructure of the NNO, induced by Nd-rich Ruddlesden-Popper Nd2NiO4 phase observed by high resolution TEM. Financial support from DFG (SFB 1073 TPA02, B07, Z02, and MO2255-4) is acknowledged.