Decoupling Carrier Concentration and Electron-Phonon Coupling in Oxide Heterostructures Observed with Resonant Inelastic X-Ray Scattering

D. Meyers, Ken Nakatsukasa, Sai Mu, Lin Hao, Junyi Yang, Yue Cao, G. Fabbris, Hu Miao, J. Pelliciari, D. McNally, M. Dantz, E. Paris, E. Karapetrova, Yongseong Choi, D. Haskel, P. Shafer, E. Arenholz, Thorsten Schmitt, Tom Berlijn, S. Johnston, Jian Liu, and M. P. M. Dean
Phys. Rev. Lett. 121, 236802 – Published 7 December 2018
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Abstract

We report the observation of multiple phonon satellite features in ultrathin superlattices of the form nSrIrO3/mSrTiO3 using resonant inelastic x-ray scattering (RIXS). As the values of n and m vary, the energy loss spectra show a systematic evolution in the relative intensity of the phonon satellites. Using a closed-form solution for the RIXS cross section, we extract the variation in the electron-phonon coupling strength as a function of n and m. Combined with the negligible carrier doping into the SrTiO3 layers, these results indicate that the tuning of the electron-phonon coupling can be effectively decoupled from doping. This work both showcases a feasible method to extract the electron-phonon coupling in superlattices and unveils a potential route for tuning this coupling, which is often associated with superconductivity in SrTiO3-based systems.

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  • Received 20 June 2018
  • Revised 15 October 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.236802

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

D. Meyers1,*, Ken Nakatsukasa2, Sai Mu3, Lin Hao2, Junyi Yang2, Yue Cao1,¶, G. Fabbris4, Hu Miao1, J. Pelliciari5, D. McNally5, M. Dantz5, E. Paris5, E. Karapetrova4, Yongseong Choi4, D. Haskel4, P. Shafer6, E. Arenholz6, Thorsten Schmitt5, Tom Berlijn7,8,†, S. Johnston2,9,‡, Jian Liu2,§, and M. P. M. Dean1,∥

  • 1Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 3Department of Condensed Matter Physics and Materials Science, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
  • 4Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5Photon Science Division, Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 6Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 7Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 8Computational Science and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 9Joint Institute of Advanced Materials at The University of Tennessee, Knoxville, Tennessee 37996, USA

  • *djmeyers@berkeley.edu; Present address: Department of Materials Science and Engineering, University of California Berkeley, Berkeley, California 94720, USA
  • tberlijn@gmail.com
  • sjohn145@utk.edu
  • §jianliu@utk.edu
  • mdean@bnl.gov
  • Present address: Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

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Issue

Vol. 121, Iss. 23 — 7 December 2018

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