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.
Decoupling Carrier Concentration and Electron-Phonon Coupling in Oxide Heterostructures Observed with Resonant Inelastic X-Ray Scattering / Meyers, D., Nakatsukasa, K., Mu, S., Hao, L., Yang, J., Cao, Y., Fabbris, G., Miao, H.u., Pelliciari, J., Mcnally, D., Dantz, M., Paris, E., Karapetrova, E., Choi, Y., Haskel, D., Shafer, P., Arenholz, E., Schmitt, T., Berlijn, T., Johnston, S., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 121:23(2018), pp. 1-5. [10.1103/physrevlett.121.236802]
Decoupling Carrier Concentration and Electron-Phonon Coupling in Oxide Heterostructures Observed with Resonant Inelastic X-Ray Scattering
Pelliciari, J.;Paris, E.;
2018
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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