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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], exhibiting two distinct and controllable charged interface structures [(LaO) +/(TiO 2) 0 and (SrO) 0/(CrO 2) -] with induced polarization, and a resulting depth-dependent potential. In this study, we have used soft- and hard-x-ray standing-wave excited photoemission spectroscopy (SW-XPS) to quantitatively determine the elemental depth profile, interface properties, and depth distribution of the polarization-induced built-in potentials. We observe an alternating charged interface configuration: a positively charged (LaO) +/(TiO 2) 0 intermediate layer at the LCO top/STO bottom interface and a negatively charged (SrO) 0/(CrO 2) - intermediate layer at the STO top/LCO bottom interface. Using core-level SW data, we have determined the depth distribution of species, including through the interfaces, and these results are in excellent agreement with scanning transmission electron microscopy and electron energy-loss spectroscopy mapping of local structure and composition. SW-XPS also enabled deconvolution of the LCO and STO contributions to the valence-band (VB) spectra. Using a two-step analytical approach involving first SW-induced core-level binding-energy shifts and then VB modeling, the variation in potential across the complete superlattice is determined in detail. As a result, this potential is in excellent agreement with density functional theorymore » models, confirming this method as a generally useful tool for interface studies.« less

Authors:
 [1];  [1];  [2];  [3];  [3];  [4];  [3];  [5];  [5];  [5];  [6];  [6];  [7];  [6];  [8];  [6];  [1]
  1. Univ. of California, Davis, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Auburn Univ., Auburn, AL (United States)
  3. Synchrotron SOLEIL, Gif-sur-Yvette (France)
  4. Peter Grünberg Institut PGI-6, Julich (Germany); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Peter Grünberg Institut PGI-6, Julich (Germany)
  8. Peter Grünberg Institut PGI-6, Julich (Germany)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1563966
Alternate Identifier(s):
OSTI ID: 1478562
Grant/Contract Number:  
AC02-05CH11231; SC0014697; 10122
Resource Type:
Accepted Manuscript
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:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

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. https://www.osti.gov/servlets/purl/1563966.
@article{osti_1563966,
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], exhibiting two distinct and controllable charged interface structures [(LaO)+/(TiO2)0 and (SrO)0/(CrO2)-] with induced polarization, and a resulting depth-dependent potential. In this study, we have used soft- and hard-x-ray standing-wave excited photoemission spectroscopy (SW-XPS) to quantitatively determine the elemental depth profile, interface properties, and depth distribution of the polarization-induced built-in potentials. We observe an alternating charged interface configuration: a positively charged (LaO)+/(TiO2)0 intermediate layer at the LCOtop/STObottom interface and a negatively charged (SrO)0/(CrO2)- intermediate layer at the STOtop/LCObottom interface. Using core-level SW data, we have determined the depth distribution of species, including through the interfaces, and these results are in excellent agreement with scanning transmission electron microscopy and electron energy-loss spectroscopy mapping of local structure and composition. SW-XPS also enabled deconvolution of the LCO and STO contributions to the valence-band (VB) spectra. Using a two-step analytical approach involving first SW-induced core-level binding-energy shifts and then VB modeling, the variation in potential across the complete superlattice is determined in detail. As a result, this potential is in excellent agreement with density functional theory models, confirming this method as a generally useful tool for interface studies.},
doi = {10.1103/physrevb.98.165124},
journal = {Physical Review B},
number = 16,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}

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