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

被引：25

作者：

Meyers, D. ^{[1
,10
]}

Nakatsukasa, Ken ^{[2
]}

Mu, Sai ^{[3
]}

Hao, Lin ^{[2
]}

Yang, Junyi ^{[2
]}

Cao, Yue ^{[1
,11
]}

Fabbris, G. ^{[4
]}

Miao, Hu ^{[1
]}

Pelliciari, J. ^{[5
]}

McNally, D. ^{[5
]}

Dantz, M. ^{[5
]}

Paris, E. ^{[5
]}

Icarapetrova, E. ^{[4
]}

Choi, Yongseong ^{[4
]}

Haskel, D. ^{[4
]}

Shafer, P. ^{[6
]}

Arenholz, E. ^{[6
]}

Schmitt, Thorsten ^{[5
]}

Berlijn, Tom ^{[7
,8
]}

Johnston, S. ^{[2
,9
]}

Liu, Jian ^{[2
]}

Dean, M. P. M. ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA

[2] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[3] Oak Ridge Natl Lab, Dept Condensed Matter Phys & Mat Sci, Oak Ridge, TN 37830 USA

[4] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[5] Paul Scherrer Inst, Photon Sci Div, Swiss Light Source, CH-5232 Villigen, Switzerland

[6] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[7] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

[8] Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN 37831 USA

[9] Univ Tennessee, Joint Inst Adv Mat, Knoxville, TN 37996 USA

[10] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[11] Argonne Natl Lab, Mat Sci Div, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 121卷 / 23期

基金：

瑞士国家科学基金会;

关键词：

SUPERCONDUCTIVITY; INTERFACES;

D O I：

10.1103/PhysRevLett.121.236802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 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 mute for tuning this coupling, which is often associated with superconductivity in SrTiO3-based systems.

引用

页数：6

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