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Title: Decoupling carrier concentration and electron-phonon coupling in oxide heterostructures observed with resonant inelastic x-ray scattering

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [2];  [2];  [1];  [4];  [1];  [5];  [5];  [5];  [5];  [4];  [4];  [4];  [6];  [6];  [5];  [7];  [8] more »;  [2]; ORCiD logo [1] « less
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Department of Condensed Matter Physics and Materials Science
  2. Univ. of Tennessee, Knoxville, TN (United States). Department of Physics and Astronomy
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Department of Condensed Matter Physics and Materials Science
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
  5. Paul Scherrer Institut (Switzerland). Research Department Synchrotron Radiation and Nanotechnology
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS) and Computational Science and Engineering Division
  8. Univ. of Tennessee, Knoxville, TN (United States). Department of Physics and Astronomy and Joint Institute of Advanced Materials
+ Show Author Affiliations

We report the observation of multiple phonon satellite features in ultrathin superlattices of the form nSrIrO_{3}/mSrTiO_{3} 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 SrTiO_{3} 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 SrTiO_{3}-based systems.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC). Early Career Award and National Energy Research Scientific Computing Center (NERSC); Swiss National Science Foundation (SNSF); Paul Scherrer Institut; University of Tennessee; U.S. Department of Defense (DOD) - Defense Advanced Research Projects Agency (DARPA)
Grant/Contract Number:
SC0012704; AC02-05CH11231; AC02-06CH11357; AC05-00OR22725
OSTI ID:
1478476
Alternate ID(s):
OSTI ID: 1484975; OSTI ID: 1486946; OSTI ID: 1493884; OSTI ID: 1631599
Report Number(s):
BNL-209316-2018-JAAM
Journal Information:
Physical Review Letters, Vol. 121, Issue 23; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (6)

Magnetism in iridate heterostructures leveraged by structural distortions journal March 2019
Octahedral tilting induced isospin reorientation transition in iridate heterostructures journal October 2019
High-resolution resonant inelastic x-ray scattering study of the electron-phonon coupling in honeycomb α − Li 2 IrO 3 journal December 2019
Characterization of the soft X-ray spectrometer PEAXIS at BESSY II text January 2019
Octahedral tilting induced isospin reorientation transition in iridate heterostructures text January 2019
Nature of the charge-density wave excitations in cuprates text January 2020

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