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Surface stoichiometry of La0.7Sr0.3MnO3 during in vacuo preparation; A synchrotron photoemission study

Monsen, A. F.; Song, F.; Li, Z. S.; Boschker, J. E.; Tybell, T.; Wahlstrom, E. and Wells, Justin LU (2012) In Surface Science 606(17-18). p.1360-1366
Abstract
We present a study of the surface stoichiometry and contamination of La0.7Sr0.3MnO3 thin films following exposure to air and subsequent in vacuo preparation. Samples were studied using both soft X-ray synchrotron photoemission (hv = 150 to 350 eV) and traditional Mg-K alpha XPS (hv = 1253.6 eV) whilst annealing incrementally to approximate to 510 degrees C in low pressures of O-2. In all cases, a Mn depleted and Sr rich surface oxide layer is observed, it is of reduced crystalline quality and is charge depleted. This surface layer is weakly affected by subsequent annealing, and is partially reversed by annealing in higher O-2 pressure. Surface carbon contamination is incrementally removed by annealing at increased temperatures, and at 270... (More)
We present a study of the surface stoichiometry and contamination of La0.7Sr0.3MnO3 thin films following exposure to air and subsequent in vacuo preparation. Samples were studied using both soft X-ray synchrotron photoemission (hv = 150 to 350 eV) and traditional Mg-K alpha XPS (hv = 1253.6 eV) whilst annealing incrementally to approximate to 510 degrees C in low pressures of O-2. In all cases, a Mn depleted and Sr rich surface oxide layer is observed, it is of reduced crystalline quality and is charge depleted. This surface layer is weakly affected by subsequent annealing, and is partially reversed by annealing in higher O-2 pressure. Surface carbon contamination is incrementally removed by annealing at increased temperatures, and at 270 degrees C, it is reduced to approximate to 0.4% of the topmost unit cell. The modification of the surface stoichiometry and electronic properties is consistent with the reported loss of magnetic properties in thin LSMO films. (C) 2012 Elsevier B.V. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Synchrotron photoemission, XPS, LSMO: oxide
in
Surface Science
volume
606
issue
17-18
pages
1360 - 1366
publisher
Elsevier
external identifiers
  • wos:000306823900006
  • scopus:84862698966
ISSN
0039-6028
DOI
10.1016/j.susc.2012.04.018
language
English
LU publication?
yes
id
01ee5765-47e4-4671-87fc-54c18bd13aea (old id 3079798)
date added to LUP
2012-09-25 10:58:48
date last changed
2017-10-01 04:06:21
@article{01ee5765-47e4-4671-87fc-54c18bd13aea,
  abstract     = {We present a study of the surface stoichiometry and contamination of La0.7Sr0.3MnO3 thin films following exposure to air and subsequent in vacuo preparation. Samples were studied using both soft X-ray synchrotron photoemission (hv = 150 to 350 eV) and traditional Mg-K alpha XPS (hv = 1253.6 eV) whilst annealing incrementally to approximate to 510 degrees C in low pressures of O-2. In all cases, a Mn depleted and Sr rich surface oxide layer is observed, it is of reduced crystalline quality and is charge depleted. This surface layer is weakly affected by subsequent annealing, and is partially reversed by annealing in higher O-2 pressure. Surface carbon contamination is incrementally removed by annealing at increased temperatures, and at 270 degrees C, it is reduced to approximate to 0.4% of the topmost unit cell. The modification of the surface stoichiometry and electronic properties is consistent with the reported loss of magnetic properties in thin LSMO films. (C) 2012 Elsevier B.V. All rights reserved.},
  author       = {Monsen, A. F. and Song, F. and Li, Z. S. and Boschker, J. E. and Tybell, T. and Wahlstrom, E. and Wells, Justin},
  issn         = {0039-6028},
  keyword      = {Synchrotron photoemission,XPS,LSMO: oxide},
  language     = {eng},
  number       = {17-18},
  pages        = {1360--1366},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {Surface stoichiometry of La0.7Sr0.3MnO3 during in vacuo preparation; A synchrotron photoemission study},
  url          = {http://dx.doi.org/10.1016/j.susc.2012.04.018},
  volume       = {606},
  year         = {2012},
}