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Berlin 2018 – scientific programme

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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.

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