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HL: Fachverband Halbleiterphysik

HL 50: HL Poster IV

HL 50.48: Poster

Thursday, March 15, 2018, 19:00–21:00, Poster B

MAD-grown NdNiO₃ thin films for PEEM study of electronic phase separation — •Henrike Probst, Marius Keunecke, David Schmitt, Vitaly Bruchmann-Bamberg, Sabine Steil, Daniel Steil, Stefan Mathias, and Vasily Moshnyaga — I. Physikalisches Institut Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Rare earth nickelates (RENi0₃, RE=La, Pr, Nd, Sm) are strongly correlated electron systems in which the structure and electronic properties are interconnected. They exhibit a metal-insulator transition at T _MI ∼100-400 K, coupled to a charge/orbital ordering and structural phase transition.
Epitaxial NdNiO₃ thin films have been prepared by metalorganic aerosol deposition technique (MAD) on perovskite substrates, i.e. NdGaO₃, SrTiO₃ und LaAlO₃, to achieve different strain states of the films. Previously [Mattoni, Nature Comm. 7, 13141 (2016)], a coexistence of metallic and insulating regions at the scale of 100-200 nanometers in the vicinity of the T _MI in NdNiO₃ epitaxial thin films was suggested. Electrical resistivity measurements reveal a pronounced R(T) hysteresis, ΔT∼10-20 K, close to T _MI , thus, indicating a first-order MI transition with metastable coexistence of such regions.
To study electronic phase separation across a first-order MI transition of NdNiO₃ we will use photoemission electron microscopy (PEEM) to visualize metallic and insulating domains.