Decoupling carrier concentration and electron-phonon coupling in oxide heterostructures

ORAL

Abstract

We present the results of resonant inelastic x-ray scattering at the O K-edge on superlattices of form nSrIrO3/mSrTiO3. Multiple phonon satellite peaks are observed corresponding to the 4th longitundal optical mode of SrTiO3 allowing direct extraction of the electron-phonon coupling strength. As the values of n and m are varied a systematic change in the relative intensity of the satellite features is observed indicating large changes to the electron-phonon coupling strength. In the absence of signifcant carrier doping this result shows the heterostructure morphology is able to independently tune this important interaction. Theoretical calculations indicate the Fröhlich mechanism dominates the electron-phonon coupling in these superlattices, with the reduced polarity and increased ε∞ driving the observed changes in the electron-phonon coupling.

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Presenters

  • Derek Meyers

    Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Materials Science and Engineering, University of California, Berkeley, Brookhaven National Laboratory

Authors

  • Derek Meyers

    Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Materials Science and Engineering, University of California, Berkeley, Brookhaven National Laboratory

  • Ken Nakatsukasa

    Department of Physics and Astronomy, University of Tennesse

  • Sai Mu

    Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge National Laboratory, Department of Condensed Matter Physics and Materials Science, Oak Ridge National Laboratory

  • Lin Hao

    Physics, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Department of Physics and Astronomy, University of Tennesse

  • Junyi Yang

    Physics, University of Tennessee, Physics and Astronomy, Univ of Tennessee, Knoxville, Department of Physics and Astronomy, University of Tennesse

  • Yue Cao

    Materials Science Division, Argonne National Laboratory, Argonne National Laboratory

  • Gilberto F L Fabbris

    Advanced Photon Source, Argonne National Laboratory

  • Hu Miao

    BNL, Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory

  • Jonathan Pelliciari

    Department of Physics, Massachusetts Institute of Technology

  • Daniel McNally

    Research Department Synchrotron Radiation and Nanotechnology, Paul Scherrer Institute, Swiss Light Source, Paul Scherrer Institut

  • Marcus Dantz

    Research Department Synchrotron Radiation and Nanotechnology, Paul Scherrer Institute

  • Eugenio Paris

    Paul Scherrer Institut, Research Department Synchrotron Radiation and Nanotechnology, Paul Scherrer Institute, Swiss Light Source, Paul Scherrer Institut

  • Evguenia Karapetrova

    Advanced Photon Source, Argonne National Laboratory

  • Yongseong Choi

    Argonne National Laboratory, Advanced Photon Source, Argonne National Laboratory, Advanced Photon Source, Argonne National Lab

  • Daniel Haskel

    Advanced Photon Source, Argonne National Laboratory, Advanced Photon Source, Argonne National Lab

  • Padraic Shafer

    Advanced Light Source, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory, Advanced Light Source

  • Elke Arenholz

    Advanced Light Source, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory, Advanced Light Source

  • Schmitt Thorsten

    Paul Scherrer Institut, Research Department Synchrotron Radiation and Nanotechnology, Paul Scherrer Institute, Paul Scherrer Institute, Swiss Light Source, Paul Scherrer Institut

  • Tom Berlijn

    Oak Ridge National Laboratory, Center for Nanophase Materials, Oak Ridge National Laboratory, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory

  • Steven Johnston

    Department of Physics and Astronomy, Univ of Tennessee, Knoxville, Department of Physics and Astronomy, University of Tennesse, Physics and Astronomy, University of Tennessee, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Knoxville

  • Jian Liu

    University of Tennessee, Physics, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Physics and Astronomy, Univ of Tennessee, Knoxville, Department of Physics, University of Tennessee, Knoxville, University of Tennesse, Department of Physics and Astronomy, University of Tennesse

  • Mark Dean

    Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Department of Condensed Matter Physics and Materials Science, Upton, New York 11973, USA, Brookhaven National Laboratory, BNL, Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory