Synthesis and characterization of infinite-layer La<sub>1-x</sub>Ca<sub>x</sub>NiO<sub>2</sub> single crystals

ORAL

Abstract

Superconductivity was recently discovered in Sr-doped RNiO2 (R = Pr, Nd) thin films. However, first experiments on polycrystalline powder samples reveal no superconducting transition, raising the question whether epitaxy to a substrate is required for superconductivity in nickelates. So far, high-quality bulk single-crystalline samples have not been investigated, although they might host properties distinct from powders. We have therefore synthesized perovskite nickelate single crystals with various rare-earth cations R and dopant elements using flux growth under high pressure via a Walker-type multi-anvil apparatus. We found that especially the compound La0.8Ca0.2NiO3 can be synthesized with excellent crystalline quality and without traceable impurity phases. We will present the synthesis of La0.8Ca0.2NiO3 and the reduction to La0.8Ca0.2NiO2, together with results from scanning transmission electron microscopy, x-ray diffraction, magnetic susceptibility, electronic transport, and Raman spectroscopy measurements.

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Presenters

  • Pascal Puphal

    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
    • Max Planck Institute for Solid State Physics
    • Paul Scherrer Institut

Authors

  • Pascal Puphal

    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
    • Max Planck Institute for Solid State Physics
    • Paul Scherrer Institut

  • Yu-Mi Wu

    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany

  • Hangoo Lee

    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany

  • Katrin Fuersich

    • Max Planck Inst for Solid State Research
    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany

  • Roberto Ortiz

    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
    • Max Planck Institute for Solid State Physics

  • Matteo Minola

    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
    • Solid State spectroscopy, Max Planck Institute for Solid State Research

  • Y. Eren Suyolcu

    • Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA

  • Peter A. van Aken

    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
    • Max Planck Institute for Solid State Research

  • Bernhard Keimer

    • Max Planck Inst for Solid State Research
    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
    • Max Planck Institute for Solid State Physics
    • Max Planck Institute for Solid State Research
    • Solid State spectroscopy, Max Planck Institute for Solid State Research
    • Max Planck Institute for Solid State Research, Stuttgart, Germany

  • Masahiko Isobe

    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
    • Max Planck Institute for Solid State Physics

  • Matthias Hepting

    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
    • Max Planck Institute for Solid State Physics
    • Max Planck Institute for Solid State Research, Stuttgart, Germany