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

In this paper, we report the observation of multiple phonon satellite features in ultra thin superlattices of form nSrIrO 3/ mSrTiO 3 using resonant inelastic x-ray scattering. 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 tuning of the electron-phonon coupling can be effectively decoupled from doping. In conclusion, this work showcases both 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.
Authors:
 [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
Publication Date:
Report Number(s):
BNL-209316-2018-JAAM
Journal ID: ISSN 0031-9007
Grant/Contract Number:
SC0012704; AC02-05CH11231; AC02-06CH11357; AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1478476
Alternate Identifier(s):
OSTI ID: 1484975; OSTI ID: 1486946

Meyers, Derek, Nakatsukasa, Ken, Mu, Sai, Hao, Lin, Yang, Junyi, Cao, Yue, Fabbris, G., Miao, Hu, Pelliciari, J., McNally, D., Dantz, M., Paris, E., Karapetrova, E., Choi, Yongseong, Haskel, D., Shafer, P., Arenholz, E., Schmitt, Thorsten, Berlijn, Tom, Johnston, S., Liu, Jian, and Dean, Mark P. M.. Decoupling carrier concentration and electron-phonon coupling in oxide heterostructures observed with resonant inelastic x-ray scattering. United States: N. p., Web. doi:10.1103/PhysRevLett.121.236802.
Meyers, Derek, Nakatsukasa, Ken, Mu, Sai, Hao, Lin, Yang, Junyi, Cao, Yue, Fabbris, G., Miao, Hu, Pelliciari, J., McNally, D., Dantz, M., Paris, E., Karapetrova, E., Choi, Yongseong, Haskel, D., Shafer, P., Arenholz, E., Schmitt, Thorsten, Berlijn, Tom, Johnston, S., Liu, Jian, & Dean, Mark P. M.. Decoupling carrier concentration and electron-phonon coupling in oxide heterostructures observed with resonant inelastic x-ray scattering. United States. doi:10.1103/PhysRevLett.121.236802.
Meyers, Derek, Nakatsukasa, Ken, Mu, Sai, Hao, Lin, Yang, Junyi, Cao, Yue, Fabbris, G., Miao, Hu, Pelliciari, J., McNally, D., Dantz, M., Paris, E., Karapetrova, E., Choi, Yongseong, Haskel, D., Shafer, P., Arenholz, E., Schmitt, Thorsten, Berlijn, Tom, Johnston, S., Liu, Jian, and Dean, Mark P. M.. 2018. "Decoupling carrier concentration and electron-phonon coupling in oxide heterostructures observed with resonant inelastic x-ray scattering". United States. doi:10.1103/PhysRevLett.121.236802.
@article{osti_1478476,
title = {Decoupling carrier concentration and electron-phonon coupling in oxide heterostructures observed with resonant inelastic x-ray scattering},
author = {Meyers, Derek and Nakatsukasa, Ken and Mu, Sai and Hao, Lin and Yang, Junyi and Cao, Yue and Fabbris, G. and Miao, Hu and Pelliciari, J. and McNally, D. and Dantz, M. and Paris, E. and Karapetrova, E. and Choi, Yongseong and Haskel, D. and Shafer, P. and Arenholz, E. and Schmitt, Thorsten and Berlijn, Tom and Johnston, S. and Liu, Jian and Dean, Mark P. M.},
abstractNote = {In this paper, we report the observation of multiple phonon satellite features in ultra thin superlattices of form nSrIrO3/mSrTiO3 using resonant inelastic x-ray scattering. 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 tuning of the electron-phonon coupling can be effectively decoupled from doping. In conclusion, this work showcases both 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.},
doi = {10.1103/PhysRevLett.121.236802},
journal = {Physical Review Letters},
number = 23,
volume = 121,
place = {United States},
year = {2018},
month = {12}
}

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