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Title: Interface properties and built-in potential profile of a LaCr O 3 / SrTi O 3 superlattice determined by standing-wave excited photoemission spectroscopy

Abstract

LaCrO 3 (LCO) / SrTiO 3 (STO) heterojunctions are intriguing due to a polar discontinuity along (001), two distinct and controllable interface structures [(LaO) +/(TiO 2)0 and (SrO) 0/(CrO 2) ], and interface-induced ferroelectricity. In this study, we have used soft- and hard-x-ray standing-wave excited photoemission spectroscopy (SW-XPS) to generate a non-destructive determination of the elemental depth profile of the two interfaces, the layer-resolved valence electronic structure, and the depth distribution of interface-induced built-in potentials in the two constituent oxides. From the determined sample structure, an alternating charged interface configuration is observed: a positive charged 2-Å-thick (LaO) +/(TiO 2) 0 intermediate layer at the LCO top/STO bottom interface and a negative charged 2-Å-thick (SrO) 0/(CrO 2) intermediate layer at the STO top/LCO bottom interface. SW-XPS also enabled us to deconvolute the LCO-contributed and STO-contributed matrix-element-weighted density of states (MEWDOSs) from the valence band (VB) spectra for the LCO/STO SL. Monitoring the VB edges of the deconvoluted MEWDOS shift with a change in probing profile, the alternating charged-induced built-in potentials are observed in both constituent oxides. Finally, with a two-step simulation, the built-in potentials across the SL are resolved in detail and represented by the depth distribution of VBmore » edges.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1489034
Report Number(s):
PNNL-SA-131974
Journal ID: ISSN 2469-9950; PRBMDO
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
metal-oxide heterostructure, standing-wave excited photoemission spectroscopy, STEM-EELS composition map, built-in potential

Citation Formats

Lin, S. -C., Kuo, C. -T., Comes, R. B., Rault, J. E., Rueff, J. -P., Nemšák, S., Taleb, A., Kortright, J. B., Meyer-Ilse, J., Gullikson, E., Sushko, P. V., Spurgeon, S. R., Gehlmann, M., Bowden, M. E., Plucinski, L., Chambers, S. A., and Fadley, C. S. Interface properties and built-in potential profile of a LaCrO3/SrTiO3 superlattice determined by standing-wave excited photoemission spectroscopy. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.165124.
Lin, S. -C., Kuo, C. -T., Comes, R. B., Rault, J. E., Rueff, J. -P., Nemšák, S., Taleb, A., Kortright, J. B., Meyer-Ilse, J., Gullikson, E., Sushko, P. V., Spurgeon, S. R., Gehlmann, M., Bowden, M. E., Plucinski, L., Chambers, S. A., & Fadley, C. S. Interface properties and built-in potential profile of a LaCrO3/SrTiO3 superlattice determined by standing-wave excited photoemission spectroscopy. United States. doi:10.1103/PhysRevB.98.165124.
Lin, S. -C., Kuo, C. -T., Comes, R. B., Rault, J. E., Rueff, J. -P., Nemšák, S., Taleb, A., Kortright, J. B., Meyer-Ilse, J., Gullikson, E., Sushko, P. V., Spurgeon, S. R., Gehlmann, M., Bowden, M. E., Plucinski, L., Chambers, S. A., and Fadley, C. S. Mon . "Interface properties and built-in potential profile of a LaCrO3/SrTiO3 superlattice determined by standing-wave excited photoemission spectroscopy". United States. doi:10.1103/PhysRevB.98.165124.
@article{osti_1489034,
title = {Interface properties and built-in potential profile of a LaCrO3/SrTiO3 superlattice determined by standing-wave excited photoemission spectroscopy},
author = {Lin, S. -C. and Kuo, C. -T. and Comes, R. B. and Rault, J. E. and Rueff, J. -P. and Nemšák, S. and Taleb, A. and Kortright, J. B. and Meyer-Ilse, J. and Gullikson, E. and Sushko, P. V. and Spurgeon, S. R. and Gehlmann, M. and Bowden, M. E. and Plucinski, L. and Chambers, S. A. and Fadley, C. S.},
abstractNote = {LaCrO3 (LCO) / SrTiO3 (STO) heterojunctions are intriguing due to a polar discontinuity along (001), two distinct and controllable interface structures [(LaO)+/(TiO2)0 and (SrO)0/(CrO2)– ], and interface-induced ferroelectricity. In this study, we have used soft- and hard-x-ray standing-wave excited photoemission spectroscopy (SW-XPS) to generate a non-destructive determination of the elemental depth profile of the two interfaces, the layer-resolved valence electronic structure, and the depth distribution of interface-induced built-in potentials in the two constituent oxides. From the determined sample structure, an alternating charged interface configuration is observed: a positive charged 2-Å-thick (LaO)+/(TiO2)0 intermediate layer at the LCOtop/STObottom interface and a negative charged 2-Å-thick (SrO)0/(CrO2)– intermediate layer at the STOtop/LCObottom interface. SW-XPS also enabled us to deconvolute the LCO-contributed and STO-contributed matrix-element-weighted density of states (MEWDOSs) from the valence band (VB) spectra for the LCO/STO SL. Monitoring the VB edges of the deconvoluted MEWDOS shift with a change in probing profile, the alternating charged-induced built-in potentials are observed in both constituent oxides. Finally, with a two-step simulation, the built-in potentials across the SL are resolved in detail and represented by the depth distribution of VB edges.},
doi = {10.1103/PhysRevB.98.165124},
journal = {Physical Review B},
issn = {2469-9950},
number = 16,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}

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