Probing tailored octahedral modulations in isovalent manganite superlattices with standing-wave-excited angle-resolved photoemission

ORAL

Abstract

Tailoring and spatially-confining electronic and ferroic behavior via coherent epitaxy offers a promising avenue towards engineering new functional properties in complex oxide heterostructures [1]. Here we utilize soft x-ray standing-wave photoemission spectroscopy to non-destructively probe depth-dependent electronic structure of isovalent manganite superlattices wherein the electronic and magnetic properties are modulated with depth via O octahedra rotations. Standing-wave-excited spectroscopy of the Mn 2p and O 1s core-levels confirms isovalent nature of the Mn ions in the superlattice and reveals significant depth-dependent variations in the local chemical and electronic environment around the O atoms consistent with rotational modulations of the O octahedra. Momentum-resolved standing-wave spectroscopy reveals modulations in the valence-band dispersion of the strongly-hybridized Mn and O states. \newline [1] E. J. Moon et al., Nature Comm. 5, 5710 (2014).

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Authors

  • Weibing Yang

    Department of Physics, Temple University, Philadelphia, PA, USA, Department of Physics, Temple University, Phialdelphia, PA, USA

  • Ravini Chandrasena

    Department of Physics, Temple University, Philadelphia, PA, USA, Department of Physics, Temple University, Phialdelphia, PA, USA

  • Eun Ju Moon

    Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, USA

  • Arian Arab

    Department of Physics, Temple University, Philadelphia, PA, USA, Department of Physics, Temple University, Phialdelphia, PA, USA

  • Vladimir Strokov

    Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland, Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland

  • Steven May

    Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, USA, Drexel University

  • Alexander Gray

    Department of Physics, Temple University, Philadelphia, PA, USA, Department of Physics, Temple University, Phialdelphia, PA, USA