Electron tunneling characteristics on La[subscript 0.7]Sr[subscript 0.3]MnO[subscript 3] thin-film surfaces at high temperature

Author(s)
Katsiev, Khabiboulakh; Yildiz, Bilge; Balasubramaniam, Kavaipatti; Salvador, Paul A.
Thumbnail
DownloadYildiz_ElectronTunneling.pdf (330.7Kb)
PUBLISHER_POLICY
Alternative title
Electron tunneling characteristics on La0.7Sr0.3MnO3 thin-film surfaces at high temperature
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Metadata
Show full item record
Abstract
We report on the electron tunneling characteristics on La0.7Sr0.3MnO3 (LSM) thin-film surfaces up to 580 °C in 10[superscript −3] mbar oxygen pressure, using scanning tunneling microscopy/spectroscopy (STM/STS). A thresholdlike drop in the tunneling current was observed at positive bias in STS, which is interpreted as a unique indicator for the activation polarization in cation-oxygen bonding on LSM cathodes. Sr-enrichment was found on the surface at high temperature using Auger electron spectroscopy, and was accompanied by a decrease in tunneling conductance in STS. This suggests that Sr-terminated surfaces are less active for electron transfer in oxygen reduction compared to Mn-terminated surfaces on LSM.
Date issued
2009-09
URI
http://hdl.handle.net/1721.1/67334
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Journal
Applied Physics Letters
Publisher
American Institute of Physics
Citation
Katsiev, Khabiboulakh et al. “Electron tunneling characteristics on La[sub 0.7]Sr[sub 0.3]MnO[sub 3] thin-film surfaces at high temperature.” Applied Physics Letters 95 (2009): 092106. © 2009 American Institute of Physics.
Version: Final published version
ISSN
1077-3118
0003-6951
Collections