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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Meyers D., 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 M. P. M.,
Project Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials
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Original article (peer-reviewed)

Journal Physical Review Letters
Volume (Issue) 121(23)
Page(s) 236802 - 236802
Title of proceedings Physical Review Letters
DOI 10.1103/physrevlett.121.236802

Open Access

URL https://export.arxiv.org/abs/1810.08327
Type of Open Access Repository (Green Open Access)

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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