Disorder-free electrochemical doping of charge carriers into epitaxial La<sub>2</sub>CuO<sub>4+y</sub> films

ORAL

Abstract

Interesting new electronic phases in oxides can be explored by tuning parameters like external fields, chemical composition, epitaxial strain, etc. However, doping oxide heterostructures by chemical substitution or by variation of the oxygen stoichiometry usually comes at the expense of significant disorder which can negatively affect the desired ground state.
In this talk, I will outline a new, controlled approach to alter the oxygen concentration in thin films of La2CuO4+y using ex-situ electrochemistry. By allowing the oxygen ions to also penetrate into the substrate, we produce a lattice distortion in it. This modified structure is later stabilized in the film as well, due to the epitaxial relationship with the substrate. This results in high superconducting transition temperatures and novel structural dopant order with long-range coherence - reminiscent of 245 iron-selenide superconductors. Thus, I will demonstrate a general method to introduce interlayer oxygen with low disorder and applicability throughout a wide range of oxide heterostructures.

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Presenters

  • Alex Frano

    • Physics, University of California, San Diego

Authors

  • Alex Frano

    • Physics, University of California, San Diego

  • Martin Bluschke

    • Max Planck Institute for Solid State Research

  • Zhijun Xu

    • NCNR, National Institute of Standards and Technology
    • NIST Center for Neutron Research
    • University of Maryland and NIST Center for Neutron Research

  • Ronald Marks

    • Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory

  • Apurva Mehta

    • Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory

  • Valery Borzenets

    • Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory

  • Ming Yi

    • Physics Department, University of California at Berkeley
    • Physics, University of California, Berkeley
    • Univ of California - Berkeley
    • University of California - Berkeley
    • University of California

  • Benjamin Frandsen

    • Materials Sciences Division, Lawrence Berkeley National Laboratory
    • Physics, University of California, Berkeley
    • Univ of California - Berkeley
    • Department of Physics, University of California, Berkeley

  • Yi Lu

    • Max Planck Institute for Solid State Research

  • Derek Meyers

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
    • Brookhaven Natl Lab

  • Gideok Kim

    • Max Planck Institute for Solid State Research
    • Center for Correlated Electron Systems, Institute for Basic Science

  • Georg Christiani

    • Max Planck Institute for Solid State Research

  • Gennady Logvenov

    • Max Planck Institute for Solid State Research

  • Eva Benckiser

    • Max Planck Institute for Solid State Research

  • Bernhard Keimer

    • Max Planck Institute for Solid State Research
    • Max-Planck-Institut für Festkörperforschung
    • Solid-state spectroscopy, Max Planck Institute for Solid-State Research

  • Robert Birgeneau

    • Physics Department, University of California at Berkeley
    • Physics, University of California, Berkeley
    • UC Berkeley